fix(android): disable AGP new-DSL mode to fix signReleaseBundle NullPointerException

AGP 9+ defaults to new-DSL-only mode, which causes a NullPointerException
when conditionally creating signingConfigs inside the android {} block.
Setting android.newDsl=false restores the previous evaluation behaviour.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.daggerignore

@@ -0,0 +1,20 @@
+# Dagger context ignore file.
+# Since we use explicit inclusion in ci/main.go (Base function),
+# we only need to ignore large or sensitive directories here to
+# avoid unnecessary upload overhead to the Dagger engine.
+
+.git/
+build/
+.dart_tool/
+.fvm/
+.pub-cache/
+node_modules/
+ios/Pods/
+macos/Pods/
+linux/flutter/ephemeral/
+website/public/
+website/resources/
+
+# Sensitive files
+.env*
+.ssh/

.envrc

@@ -14,5 +14,7 @@ PATH_add .fvm/flutter_sdk/bin
 
 PATH_add "$HOME/Android/Sdk/platform-tools"
 
+export DAGGER_NO_NAG=1
+
 # Load variables from .env
 dotenv_if_exists

.forgejo/workflows/android-emulator-tests.yml

@@ -0,0 +1,39 @@
+# We switched to Dagger. Running the emulator tests in Dagger does not really work
+# We will use an external service for device testing.
+# TODO: Switch to device testing. First choose a service. Maybe codemagic.io
+name: Android Emulator Tests (Disabled)
+
+on:
+  workflow_dispatch: # Manual trigger only
+
+jobs:
+  integration-android:
+    name: Android Emulator Integration Tests
+    runs-on: self-hosted
+    timeout-minutes: 60
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 50
+
+      - name: Enable Nix flakes
+        run: |
+          mkdir -p ~/.config/nix
+          echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
+
+      - name: Install Android SDK
+        run: |
+          SDK="${ANDROID_HOME:-$HOME/Android/Sdk}"
+          if [ ! -d "$SDK/platforms/android-34" ]; then
+            wget -q https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip -O /tmp/cmdtools.zip
+            mkdir -p "$SDK/cmdline-tools"
+            unzip -q /tmp/cmdtools.zip -d "$SDK/cmdline-tools"
+            [ -d "$SDK/cmdline-tools/cmdline-tools" ] && mv "$SDK/cmdline-tools/cmdline-tools" "$SDK/cmdline-tools/latest"
+            yes | "$SDK/cmdline-tools/latest/bin/sdkmanager" --licenses >/dev/null 2>&1 || true
+            "$SDK/cmdline-tools/latest/bin/sdkmanager" "emulator" "system-images;android-34;google_apis;x86_64"
+            "$SDK/cmdline-tools/latest/bin/sdkmanager" "platform-tools" "build-tools;34.0.0" "platforms;android-34"
+          fi
+
+      - name: Run Android Integration Tests
+        run: nix develop --no-warn-dirty --command task integration-android

.forgejo/workflows/ci.yml

@@ -8,11 +8,13 @@ on:
 jobs:
   check:
     name: Full Project Check
-    # Match the label of your self-hosted runner
     runs-on: self-hosted
+    timeout-minutes: 30
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 50
 
       - name: Enable Nix flakes
         run: |
@@ -20,9 +22,7 @@ jobs:
           echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
 
       - name: Run Full Check Suite
-        # Using nix develop ensures the runner doesn't need flutter/dart/stalwart installed globally.
-        # 'task check' runs analyze, unit tests, widget tests, and integration tests.
-        run: nix develop --command task check
+        run: nix develop --no-warn-dirty --command dagger call --progress=plain -m ci check --source .
 
   build-linux:
     name: Build Linux Release
@@ -32,11 +32,108 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 50
 
       - name: Enable Nix flakes
         run: |
           mkdir -p ~/.config/nix
           echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
 
-      - name: Build Linux
-        run: nix develop --command task build-linux-release
+      - name: Build & Deploy Linux to server
+        continue-on-error: true
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+          SSH_USER: ${{ secrets.SSH_USER }}
+          SSH_HOST: ${{ secrets.SSH_HOST }}
+        run: |
+          HASH=$(git rev-parse --short HEAD)
+          nix develop --no-warn-dirty --command dagger call --progress=plain -m ci deploy-linux --source . --ssh-key env:SSH_PRIVATE_KEY --ssh-user "$SSH_USER" --ssh-host "$SSH_HOST" --commit-hash "$HASH"
+
+  deploy-playstore:
+    name: Build & Deploy to Play Store
+    runs-on: self-hosted
+    needs: check
+    if: github.ref == 'refs/heads/main'
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 50
+
+      - name: Enable Nix flakes
+        run: |
+          mkdir -p ~/.config/nix
+          echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
+
+      - name: Install Android SDK (cached on runner between runs)
+        run: |
+          SDK="${ANDROID_HOME:-$HOME/Android/Sdk}"
+          if [ ! -d "$SDK/platforms/android-34" ]; then
+            echo "Android SDK not found, installing..."
+            wget -q https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip -O /tmp/cmdtools.zip
+            mkdir -p "$SDK/cmdline-tools"
+            unzip -q /tmp/cmdtools.zip -d "$SDK/cmdline-tools"
+            [ -d "$SDK/cmdline-tools/cmdline-tools" ] && mv "$SDK/cmdline-tools/cmdline-tools" "$SDK/cmdline-tools/latest"
+            yes | "$SDK/cmdline-tools/latest/bin/sdkmanager" --licenses >/dev/null 2>&1 || true
+            "$SDK/cmdline-tools/latest/bin/sdkmanager" "platform-tools" "build-tools;34.0.0" "platforms;android-34"
+          else
+            echo "Android SDK cached, skipping install."
+          fi
+
+      - name: Prepare Keystore
+        env:
+          ANDROID_KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
+        run: |
+          if [ -n "$ANDROID_KEYSTORE_BASE64" ]; then
+            echo "$ANDROID_KEYSTORE_BASE64" | base64 -d > android/app/upload-keystore.jks
+          else
+            echo "Error: ANDROID_KEYSTORE_BASE64 secret is not set."
+            exit 1
+          fi
+
+      - name: Build & Deploy to Play Store
+        env:
+          ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
+          PLAY_STORE_CONFIG_JSON: ${{ secrets.PLAY_STORE_CONFIG_JSON }}
+        run: |
+          nix develop --no-warn-dirty --command dagger call --progress=plain -m ci publish-android --source . --play-store-config env:PLAY_STORE_CONFIG_JSON --keystore-password env:ANDROID_KEYSTORE_PASSWORD
+
+      - name: Build & Deploy APK to server
+        continue-on-error: true
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+          SSH_USER: ${{ secrets.SSH_USER }}
+          SSH_HOST: ${{ secrets.SSH_HOST }}
+          ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
+        run: |
+          HASH=$(git rev-parse --short HEAD)
+          nix develop --no-warn-dirty --command dagger call --progress=plain -m ci deploy-apk --source . --ssh-key env:SSH_PRIVATE_KEY --ssh-user "$SSH_USER" --ssh-host "$SSH_HOST" --commit-hash "$HASH" --keystore-password env:ANDROID_KEYSTORE_PASSWORD
+
+  publish-website:
+    name: Publish Website Build History
+    runs-on: self-hosted
+    needs: [build-linux, deploy-playstore]
+    if: |
+      always() &&
+      github.ref == 'refs/heads/main' &&
+      (needs.build-linux.result == 'success' || needs.deploy-playstore.result == 'success')
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Enable Nix flakes
+        run: |
+          mkdir -p ~/.config/nix
+          echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
+
+      - name: Generate build history and deploy website
+        continue-on-error: true
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+          SSH_USER: ${{ secrets.SSH_USER }}
+          SSH_HOST: ${{ secrets.SSH_HOST }}
+        run: |
+          nix develop --no-warn-dirty --command dagger call --progress=plain -m ci publish-website --source . --ssh-key env:SSH_PRIVATE_KEY --ssh-user "$SSH_USER" --ssh-host "$SSH_HOST"

.forgejo/workflows/release.yml

@@ -1,50 +0,0 @@
-name: Release
-
-on:
-  push:
-    branches: [main]
-
-jobs:
-  deploy-playstore:
-    name: Build & Deploy to Play Store
-    runs-on: self-hosted
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Enable Nix flakes
-        run: |
-          mkdir -p ~/.config/nix
-          echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
-
-      - name: Install Android SDK (cached on runner between runs)
-        run: |
-          SDK="${ANDROID_HOME:-$HOME/Android/Sdk}"
-          if [ ! -d "$SDK/platforms/android-34" ]; then
-            echo "Android SDK not found, installing..."
-            wget -q https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip -O /tmp/cmdtools.zip
-            mkdir -p "$SDK/cmdline-tools"
-            unzip -q /tmp/cmdtools.zip -d "$SDK/cmdline-tools"
-            [ -d "$SDK/cmdline-tools/cmdline-tools" ] && mv "$SDK/cmdline-tools/cmdline-tools" "$SDK/cmdline-tools/latest"
-            yes | "$SDK/cmdline-tools/latest/bin/sdkmanager" --licenses >/dev/null 2>&1 || true
-            "$SDK/cmdline-tools/latest/bin/sdkmanager" "platform-tools" "build-tools;34.0.0" "platforms;android-34"
-          else
-            echo "Android SDK cached, skipping install."
-          fi
-
-      - name: Prepare Keystore
-        env:
-          ANDROID_KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
-        run: |
-          if [ -n "$ANDROID_KEYSTORE_BASE64" ]; then
-            echo "$ANDROID_KEYSTORE_BASE64" | base64 -d > android/app/upload-keystore.jks
-          else
-            echo "Error: ANDROID_KEYSTORE_BASE64 secret is not set."
-            exit 1
-          fi
-
-      - name: Build & Deploy to Play Store
-        env:
-          ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
-          PLAY_STORE_CONFIG_JSON: ${{ secrets.PLAY_STORE_CONFIG_JSON }}
-        run: nix develop --command task deploy-android-bundle

.forgejo/workflows/windows-nightly.yml

@@ -0,0 +1,49 @@
+name: Windows Nightly
+
+on:
+  schedule:
+    - cron: '0 2 * * *'
+  workflow_dispatch:
+
+jobs:
+  windows-nightly:
+    # Disabled until a self-hosted runner with label "windows-runner" is registered.
+    name: Build & Deploy Windows (Nightly)
+    runs-on: windows-runner
+    if: false
+    continue-on-error: true
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check for recent changes on main
+        run: |
+          $changes = git log --oneline --since "24 hours ago" origin/main
+          if (-not $changes) {
+            Write-Output "No changes in last 24 hours, skipping build."
+            Add-Content -Path $env:GITHUB_ENV -Value "SKIP_BUILD=true"
+          }
+
+      - name: Build Windows
+        if: env.SKIP_BUILD != 'true'
+        run: task build-windows-release
+
+      - name: Set up SSH key
+        if: env.SKIP_BUILD != 'true'
+        continue-on-error: true
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+        run: |
+          mkdir -p $env:USERPROFILE\.ssh
+          $env:SSH_PRIVATE_KEY | Out-File -FilePath "$env:USERPROFILE\.ssh\id_rsa" -Encoding ascii
+          icacls "$env:USERPROFILE\.ssh\id_rsa" /inheritance:r /grant:r "$env:USERNAME:F"
+
+      - name: Deploy Windows to server
+        if: env.SKIP_BUILD != 'true'
+        continue-on-error: true
+        env:
+          SSH_USER: ${{ secrets.SSH_USER }}
+          SSH_HOST: ${{ secrets.SSH_HOST }}
+        run: task deploy-windows-to-server

.github/workflows/ci.yml

@@ -151,3 +151,99 @@ jobs:
 
       - name: Build Linux release
         run: flutter build linux --release
+
+  deploy:
+    name: Deploy Linux build & publish website
+    runs-on: ubuntu-latest
+    needs: build-linux
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    env:
+      SSH_HOST: ${{ secrets.SSH_HOST }}
+      SSH_USER: ${{ secrets.SSH_USER }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install build & deploy dependencies
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y --no-install-recommends \
+            libgtk-3-dev pkg-config cmake ninja-build clang \
+            libsecret-1-dev hugo rsync
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: "3.41.6"
+          channel: stable
+          cache: true
+
+      - name: Cache pub packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.pub-cache
+          key: pub-${{ hashFiles('pubspec.lock') }}
+          restore-keys: pub-
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Generate Drift code
+        run: flutter pub run build_runner build --delete-conflicting-outputs
+
+      - name: Generate changelog
+        run: |
+          mkdir -p assets
+          git log -n 50 \
+            --pretty=format:'* %ad [%h](https://codeberg.org/guettli/sharedinbox/commit/%H): %s' \
+            --date=short > assets/changelog.txt
+
+      - name: Setup SSH
+        run: |
+          mkdir -p ~/.ssh
+          printf '%s\n' "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
+          chmod 600 ~/.ssh/id_ed25519
+
+      - name: Build Linux release
+        run: |
+          HASH=$(git rev-parse --short HEAD)
+          flutter build linux --release --no-pub --dart-define=GIT_HASH=$HASH
+
+      - name: Deploy Linux build to server
+        run: |
+          HASH=$(git rev-parse --short HEAD)
+          DATE_PATH=$(date -u +%Y/%m/%d)
+          REMOTE_DIR="public_html/builds/$DATE_PATH"
+          TARBALL="sharedinbox-linux-amd64-$HASH.tar.gz"
+          tar -czf /tmp/$TARBALL -C build/linux/x64/release bundle
+          ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "mkdir -p $REMOTE_DIR"
+          scp -o StrictHostKeyChecking=no /tmp/$TARBALL "$SSH_USER@$SSH_HOST:$REMOTE_DIR/$TARBALL"
+          DOWNLOAD_URL="https://sharedinbox.de/builds/$DATE_PATH/$TARBALL"
+          EXISTING=$(ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" \
+            "cat public_html/latest.json 2>/dev/null || echo '{}'")
+          WINDOWS_URL=$(echo "$EXISTING" | \
+            python3 -c "import json,sys; d=json.load(sys.stdin); print(d.get('windows',''))" \
+            2>/dev/null || true)
+          if [ -n "$WINDOWS_URL" ]; then
+            echo "{\"version\":\"$HASH\",\"linux\":\"$DOWNLOAD_URL\",\"windows\":\"$WINDOWS_URL\"}" | \
+              ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
+          else
+            echo "{\"version\":\"$HASH\",\"linux\":\"$DOWNLOAD_URL\"}" | \
+              ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
+          fi
+
+      - name: Generate build history pages
+        run: python3 scripts/generate_build_history.py
+
+      - name: Build website
+        env:
+          HUGO_PARAMS_GITVERSION: ${{ github.sha }}
+        run: hugo --source website --minify
+
+      - name: Deploy website
+        run: |
+          rsync -avz --delete \
+            --exclude='*.apk' \
+            --exclude='*.tar.gz' \
+            -e "ssh -o StrictHostKeyChecking=no" \
+            website/public/ \
+            "$SSH_USER@$SSH_HOST:public_html/"

.gitignore

@@ -58,6 +58,10 @@ linux/flutter/generated_plugins.cmake
 .flutter-plugins-dependencies
 .metadata
 
+# --- Python ---
+__pycache__/
+*.pyc
+
 # --- Tools & Cache ---
 .fvm/
 fvm/
@@ -98,6 +102,8 @@ sharedinbox-runner/runner-data/
 website/public/
 website/resources/
 website/.hugo_build.lock
+website/content/builds/_index.md
+website/content/builds/[0-9]*/
 
 .copilot/
 .dotnet/
@@ -105,4 +111,9 @@ website/.hugo_build.lock
 .wget-hsts
 
 tmp/
+test/widget/failures/
 .claude*
+
+dagger-certs
+.Xauthority
+.sharedinbox-agent-state.json

.pre-commit-config.yaml

@@ -12,6 +12,12 @@ repos:
 
   - repo: local
     hooks:
+      - id: check-no-binary
+        name: check for binary files (build artifacts, databases)
+        language: system
+        entry: bash -c 'cd "$(git rev-parse --show-toplevel)" && scripts/check_no_binary.sh'
+        pass_filenames: false
+        always_run: true
       - id: forbidden-files-hook
         name: check for forbidden home-directory files
         language: system

AGENTS.md

@@ -1,5 +1,38 @@
 # SharedInbox — Development Guide
 
+## Codeberg
+
+We use Codeberg: https://codeberg.org/guettli/sharedinbox/
+
+CLI tool `fgj` is available to query issues/PRs/actions.
+
+## Issue Label Workflow
+
+We use issues, follow this label state machine:
+
+- **State/Ready** — Issue is available to pick up
+- **State/InProgress** — Set this when you start working on an issue
+- **State/Question** — Set this when you hit a blocker or need clarification
+
+List open issues ready to pick up:
+
+```bash
+fgj issue list --json --state open | jq '[.[] | select(.labels[].name == "State/Ready")] | .[] | {number, title, html_url}'
+```
+
+Rules:
+
+- Never start work on an issue without `State/Ready`
+- Switch `State/Ready` → `State/InProgress` as your **first action** when picking up an issue — before reading any code:
+  ```bash
+  fgj issue edit <NUMBER> --remove-label "State/Ready" --add-label "State/InProgress"
+  ```
+- If blocked, replace current state label with `State/Question` and leave a comment explaining the blocker
+- When done and CI is green, close the issue:
+  ```bash
+  fgj issue close <NUMBER>
+  ```
+
 ## Code conventions
 
 - Avoid `else`, use "early return".

DAGGER.md

@@ -0,0 +1,73 @@
+# Dagger CI/CD Setup
+
+This project has migrated from Taskfile-based CI to **Dagger**. This document explains the infrastructure setup for the shared Dagger Server.
+
+## Architecture
+
+We use a **Shared Dagger Server** approach for both local development and CI. This allows multiple users to share a single Dagger Engine and its cache, significantly speeding up builds.
+
+- **Container Engine:** Rootless Podman (managed by the `dagger-svc` user).
+- **Orchestration:** System-wide `systemd` service.
+- **Access:** Users connect via TCP (localhost) or Unix Socket.
+
+## Server Setup (Admin)
+
+### 1. Dedicated Service User
+A dedicated user `dagger-svc` owns the Dagger Engine and its cache.
+
+```bash
+sudo useradd -m -s /bin/bash dagger-svc
+sudo loginctl enable-linger dagger-svc
+```
+
+**Why Lingering?**
+Lingering is required for rootless users to maintain a persistent background session. It ensures that `/run/user/<UID>` and the user-level Dagger/Podman namespaces are initialized at boot and remain active even when the user is not logged in.
+
+### 2. Systemd Service
+The engine is managed by a system-wide systemd service located at `/etc/systemd/system/dagger-engine.service`.
+
+```ini
+[Unit]
+Description=Dagger Engine (Shared Server)
+After=network.target
+
+[Service]
+Type=simple
+User=dagger-svc
+Group=dagger-svc
+WorkingDirectory=/home/dagger-svc
+# Replace 1003 with the actual UID of dagger-svc
+Environment=DOCKER_HOST=unix:///run/user/1003/podman/podman.sock
+Environment=XDG_RUNTIME_DIR=/run/user/1003
+ExecStart=/usr/bin/nix run github:dagger/nix/v0.11.4#dagger -- engine --addr tcp://0.0.0.0:8080
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
+```
+
+## Client Configuration
+
+To connect to the shared engine, users should set the `_DAGGER_RUNNER_HOST` environment variable.
+
+### Local Development (.env)
+The project uses a `.env` file to manage the connection string. Ensure your `.env` contains:
+
+```bash
+_DAGGER_RUNNER_HOST=tcp://127.0.0.1:8080
+```
+
+### Usage
+Once the environment is set up, you can run the Dagger pipeline. For non-interactive environments (CI, LLMs), use `--progress=plain` for readable logs:
+
+```bash
+nix develop --command dagger call --progress=plain -m ci check --source .
+```
+
+## CI Integration (Codeberg/Forgejo)
+
+The CI workflow in `.forgejo/workflows/ci.yml` is configured to use the Dagger module located in the `ci/` directory.
+
+- **Check Suite:** Runs analysis and tests in parallel.
+- **Builds:** Produces Linux and Android artifacts.
+- **Caching:** When using the shared engine, CI runners benefit from the persistent cache on the host.

DEVELOPMENT.md

@@ -0,0 +1,190 @@
+# Development Environment Setup
+
+This document explains how to set up a development environment for SharedInbox.
+
+## ⚠️ Security Recommendation: Use a Dedicated Linux User
+
+For enhanced security, especially when working with autonomous coding agents (like Gemini CLI in YOLO mode), we **strongly recommend** using a dedicated Linux user for this project. This isolates the project environment and prevents any potential accidental damage to your main system.
+
+### 1. Create a Dedicated User
+
+Set the user name variable (default is `si` for SharedInbox):
+
+```bash
+export DEV_USER=si
+```
+
+Create the user and add them to the `sudo` group:
+
+```bash
+sudo adduser --disabled-password newuser $DEV_USER
+```
+
+Set up SSH public key login (replace with your actual public key):
+
+```bash
+sudo mkdir -p /home/$DEV_USER/.ssh
+sudo chmod 700 /home/$DEV_USER/.ssh
+echo "ssh-ed25519 AAAA... your-key-comment" | sudo tee /home/$DEV_USER/.ssh/authorized_keys
+sudo chmod 600 /home/$DEV_USER/.ssh/authorized_keys
+sudo chown -R $DEV_USER:$DEV_USER /home/$DEV_USER/.ssh
+```
+
+### 2. Switch to the Dedicated User
+
+```bash
+ssh $DEV_USER@localhost
+```
+
+### Create ssh-keypair
+
+```bash
+ssh-keygen
+```
+
+### 3. Clone the Repository
+
+Clone the project into your new user's home directory:
+
+```bash^
+git clone ssh://git@codeberg.org/guettli/sharedinbox.git
+
+# Move git directory into $HOME
+# This user only works on the git repo. Avoid "cd sharedinbox" after each login...
+mv sharedinbox/* .
+mv sharedinbox/.??* .
+rmdir sharedinbox/
+```
+
+### 3b. Configure Git Identity
+
+The new user needs a Git identity for commits and some scripts:
+
+```bash
+git config --global user.name "Your Name"
+git config --global user.email "your.email@example.com"
+```
+
+### 4. Install System Dependencies
+
+This project uses **Nix** with flakes to manage its toolchain (Flutter, Dart, Stalwart, etc.).
+
+```
+mkdir -p .config/nix
+
+echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
+
+nix profile add nixpkgs#direnv
+
+nix profile add nixpkgs#nix-direnv
+
+echo 'eval "$(direnv hook bash)"' >> ~/.bashrc
+source ~/.bashrc
+
+.config/direnv/direnv.toml
+```
+[global]
+hide_env_diff = true
+#log_filter = "^$"
+
+[whitelist]
+   prefix = [ "/home/DEV_USER-CHANGE_THAT" ]
+```
+
+
+
+    ### 4b. Additional Permissions (GUI & Android)
+
+    1.  **GUI Access**: To run the Linux app (`task run`) from the `si` user, you must allow it to access your X server. Run this **from your main user terminal**:
+        ```bash
+        xhost +local:$DEV_USER
+        ```
+
+    2.  **Android Emulator (KVM)**: If you plan to use the Android emulator, add the user to the `kvm` group:
+        ```bash
+        sudo usermod -aG kvm $DEV_USER
+        ```
+
+    ### 5. Project Setup
+
+    Once you are in the project directory and have the dependencies installed:
+
+    1.  **Initialize Environment**:
+        ```bash
+        cp .env.example .env
+        ```
+
+    2.  **Allow direnv**:
+        ```bash
+        direnv allow
+        ```
+        *This will trigger Nix to download and set up the environment (Flutter, Android SDK, etc.). It might take some time on the first run.*
+
+    3.  **Install Flutter (via FVM)**:
+        Nix provides FVM, which manages the pinned Flutter version.
+        ```bash
+        fvm install
+        ```
+
+    4.  **Initial Setup**:
+        Run the comprehensive setup command which handles `pub get`, code generation, and git hooks:
+        ```bash
+        task setup
+        ```
+
+### 6. Verify the Setup
+
+Run the full check suite to ensure everything is working correctly:
+
+```bash
+task check
+```
+
+### 7. Running the App
+
+To run the app on your Linux desktop:
+
+```bash
+task run
+```
+
+---
+
+## Working with VS Code
+
+To maintain isolation, it is recommended to run VS Code "remotely" on the dedicated development user.
+
+### Preferred Method: VS Code Remote - SSH
+
+The most robust way to work with a separate user is using the **VS Code Remote - SSH** extension. This allows you to run the VS Code Server as the `si` user while using your main user's GUI.
+
+1.  **Install the Extension**: Install "Remote - SSH" from the VS Code Marketplace.
+2.  **Enable SSH for the Dev User**:
+    From your main user, copy your SSH public key to the dev user:
+    ```bash
+    # As your main user:
+    sudo mkdir -p /home/$DEV_USER/.ssh
+    sudo cp ~/.ssh/id_rsa.pub /home/$DEV_USER/.ssh/authorized_keys
+    sudo chown -R $DEV_USER:$DEV_USER /home/$DEV_USER/.ssh
+    sudo chmod 700 /home/$DEV_USER/.ssh
+    sudo chmod 600 /home/$DEV_USER/.ssh/authorized_keys
+    ```
+3.  **Connect**:
+    In VS Code, open the Command Palette (`Ctrl+Shift+P`) and select `Remote-SSH: Connect to Host...`.
+    Enter: `si@localhost` (or `$DEV_USER@localhost`).
+4.  **Install Extensions in the Remote**:
+    Once connected, you will need to install the following extensions *on the remote user*:
+    *   **Dart** / **Flutter**
+    *   **direnv**: (by mkhl) Highly recommended to automatically load the Nix environment inside VS Code.
+    *   **Nix IDE**: For syntax highlighting.
+
+### Why SSH?
+Using SSH to `localhost` is preferred over complex X11/Wayland permission hacks. It provides a clean boundary for the VS Code process and any integrated terminal or coding agents, ensuring they cannot access your personal files in `/home/$YOUR_USER`.
+
+> **Note on Security:** While these instructions add the user to the `sudo` group for convenience during setup, you can remove it later with `sudo gpasswd -d $DEV_USER sudo` to further restrict the user and any coding agents.
+
+---
+
+## Daily Workflow
+
+Refer to the [README.md](./README.md#daily-workflow) for common development tasks and commands.

PLAN_ISSUE_21.md

@@ -0,0 +1,59 @@
+# Implementation Plan: Secure WebView for HTML Emails (#21)
+
+## Goal
+Replace the current `flutter_html` based rendering with a hardened WebView-based approach to improve rendering fidelity while strictly enforcing security and privacy.
+
+## 1. Dependency Management
+- **Core**: `webview_flutter` (v4+)
+- **Linux Platform**: `webview_flutter_linux` (Official community-supported or WebKitGTK based implementation). *Note: I will verify the exact package name during implementation.*
+- **Utilities**: `url_launcher` (existing) for opening links in the system browser.
+
+## 2. Secure WebView Component (`lib/ui/widgets/secure_email_webview.dart`)
+Create a new widget `SecureEmailWebView` that encapsulates the `WebViewWidget` and its controller.
+
+### Configuration & Hardening
+- **Disable JavaScript**: `controller.setJavaScriptMode(JavaScriptMode.disabled)`.
+- **Background**: Match the application theme (e.g., transparent or surface color).
+- **Security Headers/CSP**: Inject a Content Security Policy via `<meta>` tag in the HTML wrapper:
+  - `default-src 'none'; style-src 'unsafe-inline'; img-src 'self' data:;` (Blocks all external assets by default).
+
+### Image Blocking Logic
+- **Initial State**: Block remote images by injecting a CSP that restricts `img-src` to `data:` and local schemes.
+- **Toggle Mechanism**:
+  - Provide a "Load Remote Images" button in the Flutter UI.
+  - When triggered, re-render the HTML with an updated CSP: `img-src * data:;`.
+
+### Link Interception & Phishing Protection
+- Implement `NavigationDelegate.onNavigationRequest`.
+- **Process**:
+  1. Intercept any URL that doesn't start with `about:blank` or `data:`.
+  2. Block the navigation in the WebView.
+  3. Trigger a Flutter `showDialog` for confirmation.
+- **Phishing Protection Dialog**:
+  - Show the full URL.
+  - **Bold the FQDN**: Parse the URL using `Uri.parse`.
+    - Example: `https://`**`important-bank.com`**`/login`
+  - "Open in Browser" button uses `url_launcher`.
+
+## 3. Integration Plan
+### Step 1: Initialization
+Modify `lib/main.dart` to initialize the Linux WebView platform (using `webview_flutter_linux` or similar) during app startup.
+
+### Step 2: Replace Renderer in Screens
+- **EmailDetailScreen**: Replace `Html(...)` with `SecureEmailWebView(html: body.htmlBody!)`.
+- **ThreadDetailScreen**: Replace `Html(...)` with `SecureEmailWebView(html: body.htmlBody!)`.
+- Remove `flutter_html` imports and dependencies once migration is complete.
+
+## 4. Verification & Security Audit
+- **Manual Tests**:
+  - Open emails with complex HTML layouts.
+  - Verify images are blocked initially.
+  - Verify "Load images" works.
+  - Click various links (http, https, mailto) and verify the confirmation dialog and FQDN bolding.
+- **Security Check**:
+  - Verify that `<script>` tags are not executed.
+  - Verify no network requests for external images occur before user consent (via DevTools or proxy).
+
+## 5. Potential Challenges
+- **Linux WebView Stability**: WebKitGTK on Linux can sometimes have rendering or sizing issues in Flutter.
+- **Scrolling**: Ensuring the WebView integrates smoothly into the `ListView` of the email detail screen (might require fixed height or `SizedBox`).

SYNC.md

@@ -0,0 +1,206 @@
+# Email Sync Architecture
+
+This document describes the full lifecycle of an email action — from the moment the user taps
+a button to server confirmation — covering the IMAP IDLE loop, JMAP push/poll, the pending-change
+queue, exponential backoff, and the undo/cancel mechanism.
+
+For the database schema and protocol-level implementation details see [DB-SYNC.md](DB-SYNC.md).
+
+---
+
+## 1. Components
+
+| Component | File | Role |
+|-----------|------|------|
+| `AccountSyncManager` | `lib/core/sync/account_sync_manager.dart` | Owns one `_SyncLoop` per account; starts, stops, and wakes sync loops |
+| `_AccountSync` | same file | IMAP sync loop (IDLE + incremental fetch) |
+| `_JmapAccountSync` | same file | JMAP sync loop (SSE push + poll fallback) |
+| `EmailRepositoryImpl` | `lib/data/repositories/email_repository_impl.dart` | All DB reads/writes and network calls |
+| `pending_changes` table | `lib/data/db/database.dart` | Protocol-agnostic outbound mutation queue |
+| `UndoService` | `lib/core/services/undo_service.dart` | Persisted undo history; cancel-or-reverse logic |
+
+---
+
+## 2. Lifecycle of an email mutation (e.g. "Mark as read")
+
+```
+User taps "Mark as read"
+        │
+        ▼
+EmailRepository.setFlag(id, seen: true)
+        │
+        ├─ 1. Write optimistic update to local DB
+        │      emails.is_seen = true
+        │
+        └─ 2. Insert row into pending_changes
+               { type: 'flag_seen', email_id: id, payload: {seen: true} }
+               (IMAP: includes uid + mailboxPath for the STORE command)
+               (JMAP: includes just the flag map for Email/set)
+
+[UI immediately reflects the change via Drift's reactive streams]
+
+        │
+        ▼ (next sync cycle, triggered by IMAP IDLE / JMAP push / wakeUp)
+_SyncLoop._flush() / flushPendingChanges()
+        │
+        ├─ IMAP: open connection → STORE uid +FLAGS (\Seen) → close
+        │
+        └─ JMAP: Email/set { update: { id: { keywords: { "$seen": true } } } }
+               If stateMismatch → clear checkpoint → full re-sync
+
+        │
+        ▼
+pending_changes row deleted on success
+(on permanent error: retry count incremented; evicted after 5 failures)
+```
+
+---
+
+## 3. IMAP sync loop
+
+The IMAP loop runs one coroutine per account (`_AccountSync`):
+
+```
+start()
+  │
+  ▼
+[forever loop]
+  ├─ flushPendingChanges()   ← drain outbound queue first
+  ├─ syncMailboxes()         ← detect new/removed mailboxes
+  ├─ for each mailbox:
+  │    syncEmails()          ← incremental: fetch only UIDs > lastUid
+  │                             deletion reconciliation: remove rows
+  │                             whose UID is absent from the server
+  └─ _idle()                 ← IMAP IDLE for up to 25 min (RFC 2177)
+       │                        Wakes on: server EXISTS/EXPUNGE/FLAGS
+       │                        or syncNow() signal from UI
+       └─ repeat
+```
+
+**Incremental sync checkpoint** — `sync_state` table stores `(accountId, mailbox, lastUid, uidValidity)`.
+On each run, only UIDs greater than `lastUid` are fetched. If `uidValidity` changes the full
+folder is re-scanned and the checkpoint is reset.
+
+**IDLE cap** — IDLE sessions are limited to 25 minutes per the RFC. The loop also wakes
+immediately if `syncNow()` is called (e.g. user pulls-to-refresh).
+
+---
+
+## 4. JMAP sync loop
+
+The JMAP loop (`_JmapAccountSync`) follows a similar structure but uses HTTP:
+
+```
+start()
+  │
+  ▼
+[forever loop]
+  ├─ flushPendingChanges()   ← Email/set for queued mutations
+  ├─ syncMailboxes()         ← Mailbox/get or Mailbox/changes
+  ├─ for each mailbox:
+  │    syncEmails()          ← Email/query + Email/get (first run)
+  │                             Email/changes (subsequent runs, state token)
+  └─ _wait()
+       ├─ If server advertises eventSourceUrl: subscribe to SSE push
+       │    wake on "Email" change event
+       └─ Otherwise: sleep 30 s (poll fallback)
+```
+
+**State tokens** — each `Mailbox/changes` / `Email/changes` call uses the server-provided
+`state` token stored in `sync_state`. A `stateMismatch` error clears the token and triggers
+a full re-fetch.
+
+**JMAP send** — outgoing mail uses `EmailSubmission/set` when the server advertises the
+`urn:ietf:params:jmap:submission` capability; falls back to SMTP otherwise.
+
+---
+
+## 5. Exponential backoff
+
+Both loops share the same backoff policy:
+
+| Outcome | Backoff |
+|---------|---------|
+| Sync succeeded | Reset to 5 s |
+| Network / server error | Double previous backoff, capped at 900 s (15 min) |
+
+The backoff counter (`_backoffSeconds`) is per-account and per-process; it resets to 5 s
+on the next successful cycle.
+
+The last error message is written to `sync_log` and surfaced in the UI via
+`syncLastErrorProvider` (the red `MaterialBanner` in the email list).
+
+---
+
+## 6. Pending-change queue
+
+`pending_changes` is a protocol-agnostic table that stores every outbound mutation before it
+reaches the server:
+
+| Column | Description |
+|--------|-------------|
+| `id` | Auto-increment primary key |
+| `email_id` | The email being mutated |
+| `type` | `flag_seen`, `flag_flagged`, `move`, `delete`, `snooze` |
+| `payload` | JSON-encoded protocol-specific arguments |
+| `retry_count` | Incremented on each failed flush attempt |
+| `created_at` | For ordering and debug |
+
+**Optimistic UI** — every mutation writes the local change first, then inserts into
+`pending_changes`. The Drift reactive stream delivers the update to the UI before
+the network round-trip completes.
+
+**Conflict resolution** — the server always wins. On the next sync cycle the server's
+state overwrites local rows. Outbound mutations are retried up to 5 times; after that
+they are evicted and a `FailedMutation` record is created. Permanent per-item JMAP
+errors (`notFound`, `forbidden`) skip the retry counter and evict immediately.
+
+---
+
+## 7. Undo and cancel
+
+When the user triggers an undoable action the UI calls:
+```
+ref.read(undoServiceProvider.notifier).pushAction(UndoAction(...))
+```
+
+`UndoService` persists the action to the `undo_actions` table (max 10 entries, FIFO).
+A `SnackBar` with an **Undo** button appears for a few seconds.
+
+When the user taps Undo, `UndoService.undo()` executes this sequence for each affected email:
+
+```
+1. cancelPendingChange(id, originalType)
+      └─ Deletes the pending_changes row if it has not been flushed yet.
+         Returns true if cancelled, false if the server already processed it.
+
+2. If the email row was hard-deleted (DELETE action):
+      restoreEmails([original])
+         └─ Re-inserts the row with its pre-deletion state,
+            placed in the correct mailbox (source if cancelled, dest otherwise).
+
+3. moveEmail(id, sourceMailboxPath)
+      └─ Optimistic local move back to the original folder.
+         If step 1 returned false (already sent to server), this enqueues
+         a reverse-move in pending_changes so the server move is undone too.
+
+4. If step 1 returned true (cancelled before flush):
+      cancelPendingChange(id, 'move')
+         └─ The reverse-move from step 3 is redundant; remove it.
+```
+
+The net result is: if the mutation was still in the queue it is silently cancelled with no
+server round-trip; if it had already been flushed, a compensating move is queued.
+
+---
+
+## 8. Key invariants
+
+- **Order**: pending changes are flushed before syncing. This prevents the server from
+  overwriting an optimistic local state that the server hasn't seen yet.
+- **Idempotency**: `flushPendingChanges` is safe to call multiple times. Each row is
+  deleted only after the server acknowledges the change.
+- **No silent data loss**: permanent server errors surface as `FailedMutation` records
+  visible in the UI (Settings → Failed mutations).
+- **UI layer isolation**: `lib/ui/` never imports `lib/data/`; all interaction goes
+  through `core/` interfaces. The `check-layers` Taskfile task enforces this.

Taskfile.yml

@@ -122,6 +122,16 @@ tasks:
     cmds:
       - fvm dart format lib test
 
+  check-mocks:
+    desc: Fail if any *.mocks.dart file is out of date (re-runs build_runner)
+    deps: [_preflight, _pub-get]
+    sources:
+      - lib/**/*.dart
+      - test/**/*.dart
+      - pubspec.yaml
+    cmds:
+      - scripts/check_mocks_fresh.sh
+
   analyze-fix:
     desc: Auto-fix lint issues with dart fix --apply
     deps: [_preflight]
@@ -161,12 +171,12 @@ tasks:
     cmds:
       - fvm flutter test
 
-  integration:
-    desc: Integration tests against a local Stalwart mail server
+  test-backend:
+    desc: Backend tests against a local Stalwart mail server
     deps: [_flutter-check]
     sources:
       - lib/**/*.dart
-      - test/integration/**/*.dart
+      - test/backend/**/*.dart
     cmds:
       - stalwart-dev/test.sh
 
@@ -216,7 +226,79 @@ tasks:
     generates:
       - build/linux/x64/release/bundle/sharedinbox
     cmds:
-      - scripts/silent_on_success.sh fvm flutter build linux --release --no-pub
+      - scripts/silent_on_success.sh fvm flutter build linux --release --no-pub --dart-define=GIT_HASH=$(git rev-parse --short HEAD)
+
+  deploy-linux-to-server:
+    desc: Package and deploy the Linux release bundle to the server, update latest.json
+    deps: [build-linux-release]
+    preconditions:
+      - sh: test -n "$SSH_USER"
+        msg: "SSH_USER is not set"
+      - sh: test -n "$SSH_HOST"
+        msg: "SSH_HOST is not set"
+    cmds:
+      - |
+        HASH=$(git rev-parse --short HEAD)
+        DATE_PATH=$(date -u +%Y/%m/%d)
+        REMOTE_DIR="public_html/builds/$DATE_PATH"
+        TARBALL="sharedinbox-linux-amd64-$HASH.tar.gz"
+        tar -czf /tmp/$TARBALL -C build/linux/x64/release bundle
+        ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "mkdir -p $REMOTE_DIR"
+        scp -o StrictHostKeyChecking=no /tmp/$TARBALL "$SSH_USER@$SSH_HOST:$REMOTE_DIR/$TARBALL"
+        DOWNLOAD_URL="https://sharedinbox.de/builds/$DATE_PATH/$TARBALL"
+        # Merge with any existing latest.json so we don't overwrite the windows key
+        EXISTING=$(ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat public_html/latest.json 2>/dev/null || echo '{}'")
+        WINDOWS_URL=$(echo "$EXISTING" | python3 -c "import json,sys; d=json.load(sys.stdin); print(d.get('windows',''))" 2>/dev/null || true)
+        if [ -n "$WINDOWS_URL" ]; then
+          echo "{\"version\":\"$HASH\",\"linux\":\"$DOWNLOAD_URL\",\"windows\":\"$WINDOWS_URL\"}" | \
+            ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
+        else
+          echo "{\"version\":\"$HASH\",\"linux\":\"$DOWNLOAD_URL\"}" | \
+            ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
+        fi
+        echo "Uploaded $TARBALL and updated latest.json"
+
+  build-windows-release:
+    desc: Build the Windows desktop app (release) — must run on a Windows machine with MSVC
+    deps: [_pub-get, generate-changelog]
+    method: timestamp
+    sources:
+      - lib/**/*.dart
+      - windows/**/*
+      - pubspec.yaml
+    generates:
+      - build/windows/x64/runner/Release/sharedinbox.exe
+    cmds:
+      - fvm flutter build windows --release --no-pub --dart-define=GIT_HASH=$(git rev-parse --short HEAD)
+
+  deploy-windows-to-server:
+    desc: Package and deploy the Windows release bundle to the server, update latest.json
+    deps: [build-windows-release]
+    preconditions:
+      - sh: test -n "$SSH_USER"
+        msg: "SSH_USER is not set"
+      - sh: test -n "$SSH_HOST"
+        msg: "SSH_HOST is not set"
+    cmds:
+      - |
+        HASH=$(git rev-parse --short HEAD)
+        DATE_PATH=$(date -u +%Y/%m/%d)
+        REMOTE_DIR="public_html/builds/$DATE_PATH"
+        ZIPFILE="sharedinbox-windows-x64-$HASH.zip"
+        cd build/windows/x64/runner && zip -r /tmp/$ZIPFILE Release/ && cd -
+        ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "mkdir -p $REMOTE_DIR"
+        scp -o StrictHostKeyChecking=no /tmp/$ZIPFILE "$SSH_USER@$SSH_HOST:$REMOTE_DIR/$ZIPFILE"
+        DOWNLOAD_URL="https://sharedinbox.de/builds/$DATE_PATH/$ZIPFILE"
+        EXISTING=$(ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat public_html/latest.json 2>/dev/null || echo '{}'")
+        LINUX_URL=$(echo "$EXISTING" | python3 -c "import json,sys; d=json.load(sys.stdin); print(d.get('linux',''))" 2>/dev/null || true)
+        if [ -n "$LINUX_URL" ]; then
+          echo "{\"version\":\"$HASH\",\"linux\":\"$LINUX_URL\",\"windows\":\"$DOWNLOAD_URL\"}" | \
+            ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
+        else
+          echo "{\"version\":\"$HASH\",\"windows\":\"$DOWNLOAD_URL\"}" | \
+            ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
+        fi
+        echo "Uploaded $ZIPFILE and updated latest.json"
 
 
   _android-avd-setup:
@@ -266,7 +348,7 @@ tasks:
     generates:
       - build/app/outputs/flutter-apk/app-release.apk
     cmds:
-      - ANDROID_HOME=${ANDROID_HOME:-$HOME/Android/Sdk} fvm flutter build apk --release --no-pub | grep -Ev "was tree-shaken|Tree-shaking can be disabled"
+      - ANDROID_HOME=${ANDROID_HOME:-$HOME/Android/Sdk} fvm flutter build apk --release --no-pub --dart-define=GIT_HASH=$(git rev-parse --short HEAD) | grep -Ev "was tree-shaken|Tree-shaking can be disabled"
 
   deploy-android-bundle:
     desc: Build release AAB and upload to Play Store internal track
@@ -288,7 +370,7 @@ tasks:
     generates:
       - build/app/outputs/bundle/release/app-release.aab
     cmds:
-      - ANDROID_HOME=${ANDROID_HOME:-$HOME/Android/Sdk} fvm flutter build appbundle --release --no-pub --build-number $(date +%s) | grep -Ev "was tree-shaken|Tree-shaking can be disabled"
+      - ANDROID_HOME=${ANDROID_HOME:-$HOME/Android/Sdk} fvm flutter build appbundle --release --no-pub --build-number $(date +%s) --build-name $(date +%y%m%d-%H%M) --dart-define=GIT_HASH=$(git rev-parse --short HEAD) | grep -Ev "was tree-shaken|Tree-shaking can be disabled"
 
   deploy-android:
     desc: Build release APK and upload via scp to $ANDROID_APK_SCP_USER@$ANDROID_APK_SCP_HOST:$ANDROID_APK_SCP_PATH
@@ -356,19 +438,73 @@ tasks:
     cmds:
       - scripts/website-verify.sh
 
+  deploy-apk-to-server:
+    desc: SCP the release APK to the server at public_html/builds/YYYY/MM/DD/
+    deps: [build-android]
+    preconditions:
+      - sh: test -n "$SSH_USER"
+        msg: "SSH_USER is not set"
+      - sh: test -n "$SSH_HOST"
+        msg: "SSH_HOST is not set"
+    cmds:
+      - |
+        HASH=$(git rev-parse --short HEAD)
+        DATE_PATH=$(date -u +%Y/%m/%d)
+        REMOTE_DIR="public_html/builds/$DATE_PATH"
+        APK_NAME="sharedinbox-mua-$HASH.apk"
+        ssh -o StrictHostKeyChecking=no "$SSH_USER@$SSH_HOST" "mkdir -p $REMOTE_DIR"
+        scp -o StrictHostKeyChecking=no \
+          build/app/outputs/flutter-apk/app-release.apk \
+          "$SSH_USER@$SSH_HOST:$REMOTE_DIR/$APK_NAME"
+        echo "Uploaded $APK_NAME to $REMOTE_DIR"
+
+  generate-build-history:
+    desc: Generate Hugo build-history pages from Linux and Android builds on the server
+    preconditions:
+      - sh: test -n "$SSH_USER"
+        msg: "SSH_USER is not set"
+      - sh: test -n "$SSH_HOST"
+        msg: "SSH_HOST is not set"
+    cmds:
+      - python3 scripts/generate_build_history.py
+
+  website-publish:
+    desc: Generate build history, build Hugo site, and rsync to server (requires SSH_USER + SSH_HOST)
+    preconditions:
+      - sh: test -n "$SSH_USER"
+        msg: "SSH_USER is not set"
+      - sh: test -n "$SSH_HOST"
+        msg: "SSH_HOST is not set"
+    cmds:
+      - task: generate-build-history
+      - task: website-deploy
+
   website-deploy:
     desc: Deploy the website via rsync to public_html
     deps: [website-build]
     cmds:
       - |
         rsync -avz --delete \
+          --exclude='*.apk' \
+          --exclude='*.tar.gz' \
           -e "ssh -o StrictHostKeyChecking=no" \
           website/public/ \
           ${SSH_USER}@${SSH_HOST}:public_html/
 
   check-fast:
     desc: Pre-commit checks — analyze + unit+widget tests + coverage gate (no build, no integration)
-    deps: [analyze, check-coverage, check-hygiene]
+    deps: [analyze, check-coverage, check-hygiene, check-layers, check-mocks]
+
+  check-layers:
+    desc: Enforce architecture — ui/ must not import data/ (only core/ interfaces allowed)
+    cmds:
+      - |
+        VIOLATIONS=$(grep -rn "package:sharedinbox/data/" lib/ui/ 2>/dev/null || true)
+        if [ -n "$VIOLATIONS" ]; then
+          echo "ERROR: UI layer imports data layer (only core/ interfaces are allowed from ui/):"
+          echo "$VIOLATIONS"
+          exit 1
+        fi
 
   check-hygiene:
     desc: Verify that no forbidden files (like home dir config) are tracked
@@ -388,7 +524,7 @@ tasks:
     internal: true
     run: once
     cmds:
-      - task: integration
+      - task: test-backend
       - task: integration-ui
 
   ci-logs:

android/app/build.gradle.kts

@@ -20,15 +20,18 @@ android {
         jvmTarget = JavaVersion.VERSION_17.toString()
     }
 
-    signingConfigs {
-        create("release") {
-            // Hardcoded alias matching t.sh
-            keyAlias = "upload"
-            // Use the same password for both key and keystore
-            val pass = System.getenv("ANDROID_KEYSTORE_PASSWORD")
-            storePassword = pass
-            keyPassword = pass
-            storeFile = file("upload-keystore.jks")
+    val keystoreFile = file("upload-keystore.jks")
+    val keystorePass: String? = System.getenv("ANDROID_KEYSTORE_PASSWORD")
+    val hasKeystore = keystoreFile.exists() && keystorePass != null
+
+    if (hasKeystore) {
+        signingConfigs {
+            create("release") {
+                keyAlias = "upload"
+                storePassword = keystorePass
+                keyPassword = keystorePass
+                storeFile = keystoreFile
+            }
         }
     }
 
@@ -44,9 +47,7 @@ android {
 
     buildTypes {
         release {
-            // Use the signing config defined above for release builds.
-            // If the keystore file exists (e.g. in CI or manually placed), sign it.
-            signingConfig = if (signingConfigs.getByName("release").storeFile?.exists() == true) {
+            signingConfig = if (hasKeystore) {
                 signingConfigs.getByName("release")
             } else {
                 signingConfigs.getByName("debug")

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-feature android:name="android.hardware.camera" android:required="false"/>
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>

android/gradle.properties

@@ -1,2 +1,3 @@
 org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true
+android.newDsl=false

ci/.gitattributes

@@ -0,0 +1,4 @@
+/dagger.gen.go linguist-generated
+/internal/dagger/** linguist-generated
+/internal/querybuilder/** linguist-generated
+/internal/telemetry/** linguist-generated

ci/.gitignore

@@ -0,0 +1,5 @@
+/dagger.gen.go
+/internal/dagger
+/internal/querybuilder
+/internal/telemetry
+/.env

ci/dagger.json

@@ -0,0 +1,7 @@
+{
+  "name": "ci",
+  "engineVersion": "v0.20.8",
+  "sdk": {
+    "source": "go"
+  }
+}

ci/go.mod

@@ -0,0 +1,53 @@
+module dagger/ci
+
+go 1.26.2
+
+require (
+	dagger.io/dagger v0.20.6-0.20260415192040-7058e9313c72
+	github.com/Khan/genqlient v0.8.1
+	github.com/dagger/otel-go v1.43.0
+	github.com/vektah/gqlparser/v2 v2.5.33
+	go.opentelemetry.io/otel v1.43.0
+	go.opentelemetry.io/otel/trace v1.43.0
+)
+
+require (
+	github.com/99designs/gqlgen v0.17.90 // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
+	github.com/sosodev/duration v1.4.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.17.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.17.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.41.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.41.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.41.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.41.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.41.0 // indirect
+	go.opentelemetry.io/otel/log v0.17.0 // indirect
+	go.opentelemetry.io/otel/metric v1.43.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.43.0
+	go.opentelemetry.io/otel/sdk/log v0.17.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.43.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
+	golang.org/x/net v0.52.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.44.0 // indirect
+	golang.org/x/text v0.35.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 // indirect
+	google.golang.org/grpc v1.79.3 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+)
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc => go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.16.0
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp => go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.16.0
+
+replace go.opentelemetry.io/otel/log => go.opentelemetry.io/otel/log v0.16.0
+
+replace go.opentelemetry.io/otel/sdk/log => go.opentelemetry.io/otel/sdk/log v0.16.0

ci/go.sum

@@ -0,0 +1,97 @@
+dagger.io/dagger v0.20.6-0.20260415192040-7058e9313c72 h1:s39e07WvaUU6tLhpojK8ZEIoIbOSn5hHOJra0waenxQ=
+dagger.io/dagger v0.20.6-0.20260415192040-7058e9313c72/go.mod h1:ZXg8+pQZaZUC8rAw4V/gPP8aKvKARIJZ+pfcV+RC1es=
+github.com/99designs/gqlgen v0.17.90 h1:wSv6blm/PoplU6QoNw83EcQpNtC0HX3/+44vITJOzpk=
+github.com/99designs/gqlgen v0.17.90/go.mod h1:GqYrEwYsqCG8VaOsq2kJUCUKwAE1T+u2i+Nj7NtXiVI=
+github.com/Khan/genqlient v0.8.1 h1:wtOCc8N9rNynRLXN3k3CnfzheCUNKBcvXmVv5zt6WCs=
+github.com/Khan/genqlient v0.8.1/go.mod h1:R2G6DzjBvCbhjsEajfRjbWdVglSH/73kSivC9TLWVjU=
+github.com/agnivade/levenshtein v1.2.1 h1:EHBY3UOn1gwdy/VbFwgo4cxecRznFk7fKWN1KOX7eoM=
+github.com/agnivade/levenshtein v1.2.1/go.mod h1:QVVI16kDrtSuwcpd0p1+xMC6Z/VfhtCyDIjcwga4/DU=
+github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883 h1:bvNMNQO63//z+xNgfBlViaCIJKLlCJ6/fmUseuG0wVQ=
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+google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.79.3 h1:sybAEdRIEtvcD68Gx7dmnwjZKlyfuc61Dyo9pGXXkKE=
+google.golang.org/grpc v1.79.3/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

ci/main.go

@@ -0,0 +1,331 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"time"
+	"dagger/ci/internal/dagger"
+)
+
+type Ci struct{}
+
+// Base container with all dependencies for Flutter and Linux builds
+func (m *Ci) Base(source *dagger.Directory) *dagger.Container {
+	// Surgical inclusion: only take what is strictly needed for the build/test.
+	// This improves caching by ignoring transient or irrelevant files.
+	source = source.Filter(dagger.DirectoryFilterOpts{
+		Include: []string{
+			"lib/",
+			"test/",
+			"assets/",
+			"scripts/",
+			"pubspec.yaml",
+			"analysis_options.yaml",
+			"linux/",
+			"android/",
+			"integration_test/",
+			"drift_schemas/",
+			"stalwart-dev/",
+		},
+	})
+
+	return dag.Container().
+		From("ghcr.io/cirruslabs/flutter:3.41.6").
+		WithExec([]string{"apt-get", "update"}).
+		WithExec([]string{"apt-get", "install", "-y",
+			"clang", "cmake", "ninja-build", "pkg-config",
+			"libgtk-3-dev", "liblzma-dev", "libsecret-1-dev",
+			"libgcrypt20-dev", "libjsoncpp-dev", "sqlite3", "curl", "python3", "iproute2"}).
+		WithExec([]string{"curl", "-sL", "https://github.com/stalwartlabs/mail-server/releases/download/v0.14.1/stalwart-x86_64-unknown-linux-gnu.tar.gz", "-o", "/tmp/stalwart.tar.gz"}).
+		WithExec([]string{"tar", "-xzf", "/tmp/stalwart.tar.gz", "-C", "/usr/local/bin", "stalwart"}).
+		WithExec([]string{"chmod", "+x", "/usr/local/bin/stalwart"}).
+		WithExec([]string{"rm", "/tmp/stalwart.tar.gz"}).
+		WithMountedCache("/root/.pub-cache", dag.CacheVolume("flutter-pub-cache")).
+		WithMountedCache("/root/.gradle", dag.CacheVolume("gradle-cache")).
+		WithEnvVariable("PUB_CACHE", "/root/.pub-cache").
+		WithDirectory("/src", source).
+		WithWorkdir("/src")
+}
+
+// Hugo container for website builds
+func (m *Ci) Hugo() *dagger.Container {
+	return dag.Container().
+		From("alpine:3.21").
+		WithExec([]string{"apk", "--no-cache", "add", "curl", "tar", "libc6-compat", "libstdc++", "gcompat"}).
+		WithExec([]string{"curl", "-sL", "https://github.com/gohugoio/hugo/releases/download/v0.152.2/hugo_extended_0.152.2_linux-amd64.tar.gz", "-o", "/tmp/hugo.tar.gz"}).
+		WithExec([]string{"tar", "-xzf", "/tmp/hugo.tar.gz", "-C", "/usr/local/bin", "hugo"}).
+		WithExec([]string{"rm", "/tmp/hugo.tar.gz"})
+}
+
+// Deploy container for rsync/ssh
+func (m *Ci) Deployer(sshKey *dagger.Secret) *dagger.Container {
+	return dag.Container().
+		From("alpine:3.21").
+		WithExec([]string{"apk", "--no-cache", "add", "rsync", "openssh-client", "python3", "tar"}).
+		WithMountedSecret("/root/.ssh/id_ed25519", sshKey, dagger.ContainerWithMountedSecretOpts{Mode: 0600}).
+		WithEnvVariable("RSYNC_RSH", "ssh -o StrictHostKeyChecking=no -i /root/.ssh/id_ed25519")
+}
+
+// Setup environment: pub get and build_runner
+func (m *Ci) Setup(source *dagger.Directory) *dagger.Container {
+	return m.Base(source).
+		WithExec([]string{"flutter", "pub", "get"}).
+		// Use --delete-conflicting-outputs to ensure generated files match the current source
+		WithExec([]string{"flutter", "pub", "run", "build_runner", "build", "--delete-conflicting-outputs"})
+}
+
+// Run hygiene check
+func (m *Ci) CheckHygiene(ctx context.Context, source *dagger.Directory) (string, error) {
+	return m.Base(source).
+		WithExec([]string{"/bin/bash", "-c", "FORBIDDEN=\".ssh .bashrc .config .local .cache .gitconfig .android Android .gradle .pub-cache .dartServer .flutter .dart-cli-completion .atuin .bash_logout .profile .zcompdump .zshrc snap .emulator_console_auth_token .lesshst .metadata .tmux.conf\"; for f in $FORBIDDEN; do if [ -e \"$f\" ]; then echo \"ERROR: Forbidden file/dir found in source: $f\"; exit 1; fi; done; echo \"Hygiene check passed.\""}).
+		Stdout(ctx)
+}
+
+// Enforce architecture — ui/ must not import data/
+func (m *Ci) CheckLayers(ctx context.Context, source *dagger.Directory) (string, error) {
+	return m.Base(source).
+		WithExec([]string{"/bin/bash", "-c", "VIOLATIONS=$(grep -rn \"package:sharedinbox/data/\" lib/ui/ 2>/dev/null || true); if [ -n \"$VIOLATIONS\" ]; then echo \"ERROR: UI layer imports data layer (only core/ interfaces are allowed from ui/):\"; echo \"$VIOLATIONS\"; exit 1; fi; echo \"Layer check passed.\""}).
+		Stdout(ctx)
+}
+
+// Run dart format check
+func (m *Ci) Format(ctx context.Context, source *dagger.Directory) (string, error) {
+	return m.Base(source).
+		WithExec([]string{"dart", "format", "--output=none", "--set-exit-if-changed", "lib", "test"}).
+		Stdout(ctx)
+}
+
+// Verify that mocks are up to date
+func (m *Ci) CheckMocks(ctx context.Context, source *dagger.Directory) (string, error) {
+	return m.Setup(source).
+		WithExec([]string{"git", "init"}).
+		WithExec([]string{"git", "config", "user.email", "ci@sharedinbox.de"}).
+		WithExec([]string{"git", "config", "user.name", "CI"}).
+		WithExec([]string{"git", "add", "."}).
+		WithExec([]string{"git", "commit", "-m", "baseline"}).
+		WithExec([]string{"flutter", "pub", "run", "build_runner", "build", "--delete-conflicting-outputs"}).
+		WithExec([]string{"/bin/bash", "-c", "CHANGED=$(find . -name '*.mocks.dart' | xargs -r git diff --exit-code); if [ $? -ne 0 ]; then echo \"ERROR: Mocks are out of date\"; exit 1; fi; echo \"Mocks are up to date.\""}).
+		Stdout(ctx)
+}
+
+// Run coverage check
+func (m *Ci) Coverage(ctx context.Context, source *dagger.Directory) (string, error) {
+	return m.Setup(source).
+		WithExec([]string{"flutter", "test", "test/unit", "--coverage"}).
+		WithExec([]string{"dart", "scripts/check_coverage.dart"}).
+		Stdout(ctx)
+}
+
+// Full check suite (equivalent to task check)
+func (m *Ci) Check(ctx context.Context, source *dagger.Directory) (string, error) {
+	setup := m.Setup(source)
+
+	// Hygiene & Layers
+	if _, err := m.CheckHygiene(ctx, source); err != nil {
+		return "Hygiene check failed", err
+	}
+	if _, err := m.CheckLayers(ctx, source); err != nil {
+		return "Layer check failed", err
+	}
+
+	// Format (Running after Setup/pub get ensures package resolution context)
+	if _, err := setup.WithExec([]string{"dart", "format", "--output=none", "--set-exit-if-changed", "lib", "test"}).Stdout(ctx); err != nil {
+		return "Format check failed", err
+	}
+
+	// Run analyze
+	analyze, err := setup.WithExec([]string{"flutter", "analyze"}).Stdout(ctx)
+	if err != nil {
+		return analyze, err
+	}
+
+	// Run coverage gate (includes unit tests)
+	coverage, err := m.Coverage(ctx, source)
+	if err != nil {
+		return coverage, err
+	}
+
+	// Run backend tests (requires Stalwart)
+	testBackend, err := setup.WithExec([]string{"stalwart-dev/test.sh"}).Stdout(ctx)
+	if err != nil {
+		return testBackend, err
+	}
+
+	return fmt.Sprintf("All checks passed!\n\nAnalysis:\n%s\n\n%s\n\nBackend Tests:\n%s\n", analyze, coverage, testBackend), nil
+}
+
+// Generate build history Hugo content by scanning the remote server
+func (m *Ci) GenerateBuildHistory(
+	ctx context.Context,
+	source *dagger.Directory,
+	sshKey *dagger.Secret,
+	sshUser string,
+	sshHost string,
+) *dagger.Directory {
+	scriptSource := source.Filter(dagger.DirectoryFilterOpts{
+		Include: []string{"scripts/generate_build_history.py", "website/"},
+	})
+
+	return dag.Container().
+		From("python:3.12-alpine").
+		WithExec([]string{"apk", "add", "--no-cache", "openssh-client"}).
+		WithMountedSecret("/root/.ssh/id_ed25519", sshKey, dagger.ContainerWithMountedSecretOpts{Mode: 0600}).
+		WithEnvVariable("SSH_USER", sshUser).
+		WithEnvVariable("SSH_HOST", sshHost).
+		WithDirectory("/src", scriptSource).
+		WithWorkdir("/src").
+		WithExec([]string{"/bin/sh", "-c", "python3 scripts/generate_build_history.py"}).
+		Directory("website/content/builds")
+}
+
+// Build and return the Hugo-based website bundle
+func (m *Ci) BuildWebsite(
+	ctx context.Context,
+	source *dagger.Directory,
+	sshKey *dagger.Secret,
+	sshUser string,
+	sshHost string,
+) *dagger.Directory {
+	// 1. Generate build history content
+	buildHistory := m.GenerateBuildHistory(ctx, source, sshKey, sshUser, sshHost)
+
+	// 2. Prepare website source (base files + generated history)
+	websiteSource := source.Filter(dagger.DirectoryFilterOpts{
+		Include: []string{"website/"},
+	}).WithDirectory("website/content/builds", buildHistory)
+
+	// 3. Build with Hugo
+	return m.Hugo().
+		WithDirectory("/src", websiteSource).
+		WithWorkdir("/src/website").
+		WithExec([]string{"hugo", "--minify"}).
+		Directory("public")
+}
+
+// Build and deploy the website to the remote server
+func (m *Ci) PublishWebsite(
+	ctx context.Context,
+	source *dagger.Directory,
+	sshKey *dagger.Secret,
+	sshUser string,
+	sshHost string,
+) (string, error) {
+	// 1. Build the website
+	public := m.BuildWebsite(ctx, source, sshKey, sshUser, sshHost)
+
+	// 2. Deploy using rsync
+	return m.Deployer(sshKey).
+		WithDirectory("/public", public).
+		WithExec([]string{"rsync", "-avz", "--delete",
+			"--exclude=*.apk", "--exclude=*.tar.gz",
+			"/public/", fmt.Sprintf("%s@%s:public_html/", sshUser, sshHost)}).
+		Stdout(ctx)
+}
+
+// Build and return the Linux bundle
+func (m *Ci) BuildLinux(source *dagger.Directory) *dagger.Directory {
+	return m.Setup(source).
+		WithExec([]string{"flutter", "build", "linux", "--debug"}).
+		Directory("build/linux/x64/debug/bundle")
+}
+
+// Build and return the Linux bundle (release)
+func (m *Ci) BuildLinuxRelease(source *dagger.Directory) *dagger.Directory {
+	return m.Setup(source).
+		WithExec([]string{"flutter", "build", "linux", "--release"}).
+		Directory("build/linux/x64/release/bundle")
+}
+
+// Package and deploy the Linux release to the server
+func (m *Ci) DeployLinux(
+	ctx context.Context,
+	source *dagger.Directory,
+	sshKey *dagger.Secret,
+	sshUser string,
+	sshHost string,
+	commitHash string,
+) (string, error) {
+	// 1. Build the release bundle
+	bundle := m.BuildLinuxRelease(source)
+
+	// 2. Package and deploy
+	datePath := time.Now().Format("2006/01/02")
+	remoteDir := fmt.Sprintf("public_html/builds/%s", datePath)
+	tarball := fmt.Sprintf("sharedinbox-linux-amd64-%s.tar.gz", commitHash)
+
+	return m.Deployer(sshKey).
+		WithDirectory("/bundle", bundle).
+		WithExec([]string{"/bin/sh", "-c", fmt.Sprintf("tar -czf /tmp/%s -C /bundle .", tarball)}).
+		WithExec([]string{"ssh", "-o", "StrictHostKeyChecking=no", "-i", "/root/.ssh/id_ed25519", fmt.Sprintf("%s@%s", sshUser, sshHost), fmt.Sprintf("mkdir -p %s", remoteDir)}).
+		WithExec([]string{"/bin/sh", "-c", fmt.Sprintf("scp -o StrictHostKeyChecking=no -i /root/.ssh/id_ed25519 /tmp/%s %s@%s:%s/%s", tarball, sshUser, sshHost, remoteDir, tarball)}).
+		Stdout(ctx)
+}
+
+// Build and return the Android APK
+func (m *Ci) BuildAndroidApk(source *dagger.Directory, keystorePassword *dagger.Secret) *dagger.File {
+	return m.Setup(source).
+		WithSecretVariable("ANDROID_KEYSTORE_PASSWORD", keystorePassword).
+		WithExec([]string{"flutter", "build", "apk", "--release"}).
+		File("build/app/outputs/flutter-apk/app-release.apk")
+}
+
+// Deploy the Android APK to the server
+func (m *Ci) DeployApk(
+	ctx context.Context,
+	source *dagger.Directory,
+	sshKey *dagger.Secret,
+	sshUser string,
+	sshHost string,
+	commitHash string,
+	keystorePassword *dagger.Secret,
+) (string, error) {
+	// 1. Build the APK
+	apk := m.BuildAndroidApk(source, keystorePassword)
+
+	// 2. Deploy
+	datePath := time.Now().Format("2006/01/02")
+	remoteDir := fmt.Sprintf("public_html/builds/%s", datePath)
+	apkName := fmt.Sprintf("sharedinbox-mua-%s.apk", commitHash)
+
+	return m.Deployer(sshKey).
+		WithFile("/tmp/app.apk", apk).
+		WithExec([]string{"ssh", "-o", "StrictHostKeyChecking=no", "-i", "/root/.ssh/id_ed25519", fmt.Sprintf("%s@%s", sshUser, sshHost), fmt.Sprintf("mkdir -p %s", remoteDir)}).
+		WithExec([]string{"/bin/sh", "-c", fmt.Sprintf("scp -o StrictHostKeyChecking=no -i /root/.ssh/id_ed25519 /tmp/app.apk %s@%s:%s/%s", sshUser, sshHost, remoteDir, apkName)}).
+		Stdout(ctx)
+}
+
+// Build and return the Android App Bundle (AAB)
+func (m *Ci) BuildAndroidRelease(source *dagger.Directory, keystorePassword *dagger.Secret) *dagger.File {
+	return m.Setup(source).
+		WithSecretVariable("ANDROID_KEYSTORE_PASSWORD", keystorePassword).
+		WithExec([]string{"flutter", "build", "appbundle", "--release"}).
+		File("build/app/outputs/bundle/release/app-release.aab")
+}
+
+// Publish the Android App Bundle to Google Play Store
+func (m *Ci) PublishAndroid(
+	ctx context.Context,
+	source *dagger.Directory,
+	playStoreConfig *dagger.Secret,
+	keystorePassword *dagger.Secret,
+) (string, error) {
+	// 1. Build the AAB
+	aab := m.BuildAndroidRelease(source, keystorePassword)
+
+	// 2. Prepare script source
+	scriptSource := source.Filter(dagger.DirectoryFilterOpts{
+		Include: []string{"scripts/deploy_playstore.py"},
+	})
+
+	// 3. Deploy
+	return dag.Container().
+		From("python:3.12-alpine").
+		WithExec([]string{"apk", "add", "--no-cache", "curl"}).
+		WithExec([]string{"pip", "install", "requests", "google-auth"}).
+		WithFile("/src/build/app/outputs/bundle/release/app-release.aab", aab).
+		WithFile("/src/scripts/deploy_playstore.py", scriptSource.File("scripts/deploy_playstore.py")).
+		WithSecretVariable("PLAY_STORE_CONFIG_JSON", playStoreConfig).
+		WithWorkdir("/src").
+		WithExec([]string{"python3", "scripts/deploy_playstore.py"}).
+		Stdout(ctx)
+}

codeberg-runner/README.md

@@ -3,3 +3,48 @@
 Installed like explained here:
 
 https://forgejo.org/docs/next/admin/actions/installation/binary/
+
+## Connecting to Dagger (via stunnel)
+
+Dagger is running on the host machine and exported via stunnel on port 8774. The runner connects to it using a local stunnel client.
+
+The following TLS secrets must be configured as environment variables in Codeberg:
+- `DAGGER_CLIENT_CERT`: Content of `client.crt`
+- `DAGGER_CLIENT_KEY`: Content of `client.key`
+- `DAGGER_CA_CERT`: Content of `ca.crt`
+
+### Setup Script
+
+This snippet can be used in a CI job to establish the connection:
+
+```bash
+# Write TLS files from environment variables
+mkdir -p /etc/dagger/tls
+echo "$DAGGER_CLIENT_CERT" > /etc/dagger/tls/client.crt
+echo "$DAGGER_CLIENT_KEY" > /etc/dagger/tls/client.key
+echo "$DAGGER_CA_CERT" > /etc/dagger/tls/ca.crt
+
+# Create stunnel configuration
+cat > /tmp/dagger-client.conf << EOF
+foreground = yes
+pid =
+
+[dagger]
+client  = yes
+accept  = 127.0.0.1:1774
+connect = <server-ip>:8774
+cert    = /etc/dagger/tls/client.crt
+key     = /etc/dagger/tls/client.key
+CAfile  = /etc/dagger/tls/ca.crt
+verify  = 2
+EOF
+
+# Start stunnel in the background
+stunnel /tmp/dagger-client.conf &
+
+# Configure Dagger to use the tunnel
+export _EXPERIMENTAL_DAGGER_RUNNER_HOST=tcp://127.0.0.1:1774
+dagger version
+```
+
+Note: Replace `<server-ip>` with the actual IP address of the machine running Dagger.

flake.lock

@@ -1,5 +1,25 @@
 {
   "nodes": {
+    "dagger": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1778107833,
+        "narHash": "sha256-q5XQep2mpgTPiWwuYB1+L2dsFeACT6sHx8J939iM+HE=",
+        "owner": "dagger",
+        "repo": "nix",
+        "rev": "873cc22ba46b73d4a6c1aa6c102ef3aabc736496",
+        "type": "github"
+      },
+      "original": {
+        "owner": "dagger",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -20,11 +40,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1778430510,
-        "narHash": "sha256-Ti+ZBvW6yrWWAg2szExVTwCd4qOJ3KlVr1tFHfyfi8Q=",
+        "lastModified": 1778737229,
+        "narHash": "sha256-6xWoytx8jFW4PF1GjRm/i/53trbpKGfz6zjzQGBr4cI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8fd9daa3db09ced9700431c5b7ad0e8ba199b575",
+        "rev": "d7a713c0b7e47c908258e71cba7a2d77cc8d71d5",
         "type": "github"
       },
       "original": {
@@ -36,6 +56,7 @@
     },
     "root": {
       "inputs": {
+        "dagger": "dagger",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }

flake.nix

@@ -4,12 +4,14 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
     flake-utils.url = "github:numtide/flake-utils";
+    dagger.url = "github:dagger/nix";
+    dagger.inputs.nixpkgs.follows = "nixpkgs";
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
+  outputs = { self, nixpkgs, flake-utils, dagger }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        pkgs = nixpkgs.legacyPackages.${system};
 
         # All Linux desktop runtime libraries needed by flutter build linux and
         # the UI integration tests (xvfb-run).  Kept as a list so we can reuse
@@ -45,8 +47,13 @@
       in {
         devShells.default = pkgs.mkShell {
           buildInputs = with pkgs; [
+            # Dagger CLI
+            dagger.packages.${system}.dagger
+
+            # Go compiler — for Dagger development
+            go
+
             # Java JDK — required by Gradle for Android builds
-            jdk17
 
             # Task runner
             go-task
@@ -83,7 +90,8 @@
             sqlite
             # python3 base + Google Play API client (for scripts/deploy_playstore.py)
             (python3.withPackages (ps: with ps; [
-              google-api-python-client
+              google-auth
+              requests
             ]))  # used by stalwart-dev/start and deploy_playstore.py
             fgj      # Codeberg/Forgejo CLI (like gh for GitHub)
           ]);

integration_test/app_e2e_test.dart

@@ -130,17 +130,12 @@ void main() {
       addTearDown(tester.view.resetPhysicalSize);
       addTearDown(tester.view.resetDevicePixelRatio);
 
-      // On Android, the keyboard-dismiss / window-resize cycle can trigger
-      // one final layout pass on already-disposed render objects (DEFUNCT).
-      // These spurious overflow errors have no effect on real functionality;
-      // filter them so they don't fail the test.
-      final prevError = FlutterError.onError;
-      FlutterError.onError = (details) {
-        final msg = details.toString();
-        if (msg.contains('DEFUNCT') || msg.contains('DISPOSED')) return;
-        prevError?.call(details);
-      };
-      addTearDown(() => FlutterError.onError = prevError);
+      // Capture the test binding's error recorder and error-widget builder
+      // BEFORE app.main() so teardown can restore both. app.main() overwrites
+      // FlutterError.onError (crash-screen handler) and ErrorWidget.builder;
+      // the test binding verifies both are unchanged after the test completes.
+      final bindingError = FlutterError.onError;
+      final bindingErrorWidgetBuilder = ErrorWidget.builder;
 
       _log('app start');
       app.main(
@@ -155,7 +150,36 @@ void main() {
           accountConnectionStatusProvider.overrideWith((ref, _) async {}),
         ],
       );
-      await pumpUntil(tester, find.text('No accounts yet.'));
+
+      // app.main() sets both FlutterError.onError (crash handler) and
+      // ErrorWidget.builder (CrashScreen builder). The binding captures
+      // ErrorWidget.builder BEFORE testBody() and verifies it is unchanged
+      // AFTER testBody() returns — addTearDown fires too late for that check.
+      // Restore ErrorWidget.builder here, immediately after app.main().
+      ErrorWidget.builder = bindingErrorWidgetBuilder;
+
+      // Override the crash handler with a filter that forwards non-spurious
+      // errors to the binding's recorder. addTearDown is fine for
+      // FlutterError.onError because the binding checks it via _recordError
+      // which is called on the next error, not in a post-body verify pass.
+      FlutterError.onError = (details) {
+        final msg = details.toString();
+        // DEFUNCT/DISPOSED: keyboard-dismiss or teardown layout errors on
+        // Android/Linux that have no effect on real functionality.
+        if (msg.contains('DEFUNCT') || msg.contains('DISPOSED')) return;
+        // _zOrderIndex: Flutter 3.41.6 bug — _RawAutocompleteState.dispose()
+        // removes _updateOptionsViewVisibility from the external FocusNode but
+        // forgets to remove _onFocusChange. When the state is rebuilt with the
+        // same FocusNode both listeners accumulate and the second hide() call
+        // hits the _zOrderIndex != null assertion in overlay.dart:1681.
+        // Tracked upstream: https://github.com/flutter/flutter/issues
+        // This filter must be removed once we upgrade past the fix.
+        if (msg.contains('_zOrderIndex')) return;
+        bindingError?.call(details);
+      };
+      addTearDown(() => FlutterError.onError = bindingError);
+
+      await pumpUntil(tester, find.text('Welcome to sharedinbox.de'));
       _log('app settled');
 
       // ── Add account ────────────────────────────────────────────────────────
@@ -248,6 +272,12 @@ void main() {
         find.widgetWithText(TextFormField, 'To'),
         userEmail,
       );
+      // Explicitly unfocus the To field so RawAutocomplete closes its overlay
+      // via a single FocusNode notification BEFORE Subject takes focus.
+      // A plain pump() is insufficient — the double hide() fires synchronously
+      // during the focus-dispatch triggered by the next enterText call.
+      FocusManager.instance.primaryFocus?.unfocus();
+      await tester.pump(const Duration(milliseconds: 300));
       await tester.enterText(
         find.widgetWithText(TextFormField, 'Subject'),
         subject,
@@ -257,6 +287,10 @@ void main() {
       await tester.ensureVisible(bodyField);
       await tester.enterText(bodyField, 'Hello from integration test!');
 
+      // Unfocus before sending so the autocomplete overlay closes cleanly
+      // before ComposeScreen is popped, avoiding a second hide() on unmount.
+      FocusManager.instance.primaryFocus?.unfocus();
+      await tester.pump();
       _log('send email');
       await tester.tap(find.byIcon(Icons.send));
       // Wait for ComposeScreen to pop back to EmailListScreen after send.

lib/core/models/email.dart

@@ -232,12 +232,29 @@ class EmailHeader {
 }
 
 /// Full message body — fetched on demand, cached in the local DB.
+class MimePart {
+  final String contentType;
+  final String? filename;
+  final int? size;
+  final String? encoding;
+  final List<MimePart> children;
+
+  const MimePart({
+    required this.contentType,
+    this.filename,
+    this.size,
+    this.encoding,
+    this.children = const [],
+  });
+}
+
 class EmailBody {
   final String emailId;
   final String? textBody;
   final String? htmlBody;
   final List<EmailAttachment> attachments;
   final List<EmailHeader> headers;
+  final MimePart? mimeTree;
 
   const EmailBody({
     required this.emailId,
@@ -245,6 +262,7 @@ class EmailBody {
     this.htmlBody,
     required this.attachments,
     this.headers = const [],
+    this.mimeTree,
   });
 }
 

lib/core/repositories/email_repository.dart

@@ -1,14 +1,19 @@
 import 'package:sharedinbox/core/models/email.dart';
 
 abstract class EmailRepository {
-  Stream<List<Email>> observeEmails(String accountId, String mailboxPath);
+  Stream<List<Email>> observeEmails(
+    String accountId,
+    String mailboxPath, {
+    int limit = 50,
+  });
 
   /// Groups emails by threadId and returns one [EmailThread] per thread,
   /// sorted by the latest message date descending.
   Stream<List<EmailThread>> observeThreads(
     String accountId,
-    String mailboxPath,
-  );
+    String mailboxPath, {
+    int limit = 50,
+  });
 
   /// Returns all emails belonging to [threadId] in [mailboxPath].
   Stream<List<Email>> observeEmailsInThread(
@@ -22,6 +27,7 @@ abstract class EmailRepository {
   Future<EmailBody> getEmailBody(String emailId);
   Future<SyncEmailsResult> syncEmails(String accountId, String mailboxPath);
   Future<void> setFlag(String emailId, {bool? seen, bool? flagged});
+  Future<void> markAllAsRead(String accountId, String mailboxPath);
   Future<void> moveEmail(String emailId, String destMailboxPath);
 
   /// Deletes the email. Returns the path of the mailbox it was moved to
@@ -35,6 +41,10 @@ abstract class EmailRepository {
   /// return the cached path without a network round-trip.
   Future<String> downloadAttachment(String emailId, EmailAttachment attachment);
 
+  /// Fetches the original RFC 2822 message from the server as a raw string.
+  /// Always performs a live network request — the raw message is not cached.
+  Future<String> fetchRawRfc822(String emailId);
+
   /// Returns emails in [mailboxPath] whose subject or body contain [query].
   /// Results come from the server (IMAP SEARCH) and are not cached.
   Future<List<Email>> searchEmails(
@@ -51,6 +61,14 @@ abstract class EmailRepository {
   /// accounts if null) whose from, to, or cc fields contain [address].
   Future<List<Email>> getEmailsByAddress(String? accountId, String address);
 
+  /// Returns unique email addresses from the local cache whose email or display
+  /// name contains [query]. Results are deduplicated and capped at [limit].
+  Future<List<EmailAddress>> searchAddresses(
+    String? accountId,
+    String query, {
+    int limit = 10,
+  });
+
   /// Sends any queued local mutations for [accountId] to the server.
   /// Returns the number of changes successfully applied.
   Future<int> flushPendingChanges(String accountId, String password);
@@ -81,6 +99,17 @@ abstract class EmailRepository {
   /// Used for the "Undo" feature when the original rows were hard-deleted (IMAP).
   Future<void> restoreEmails(List<Email> emails);
 
+  /// Finds an email in [accountId]'s mailboxes by its RFC 2822 Message-ID header.
+  /// Returns null if not found. Used during undo to locate an email after its
+  /// IMAP UID changed (e.g. after a server-applied move assigned a new UID).
+  Future<Email?> findEmailByMessageId(String accountId, String messageId);
+
+  /// Applies locally stored active Sieve rules to INBOX emails that have not
+  /// been processed yet. Records each processed email in LocalSieveApplied so
+  /// the same email is never filtered twice (across restarts or re-syncs).
+  /// Returns the number of emails where a rule matched and an action was taken.
+  Future<int> applySieveRules(String accountId);
+
   /// Emits the accountId whenever a new change is enqueued locally.
   /// Used by AccountSyncManager to trigger an immediate flush.
   Stream<String> get onChangesQueued;

lib/core/repositories/search_history_repository.dart

@@ -0,0 +1,5 @@
+abstract interface class SearchHistoryRepository {
+  Future<List<String>> getRecentSearches();
+  Future<void> saveSearch(String query);
+  Future<void> clearHistory();
+}

lib/core/repositories/share_key_repository.dart

@@ -0,0 +1,13 @@
+import 'dart:typed_data';
+
+import 'package:sharedinbox/core/services/share_encryption_service.dart';
+
+/// Stores and retrieves ephemeral X25519 key pairs for secure account sharing.
+abstract class ShareKeyRepository {
+  /// Generates a new key pair and persists it with a 20-minute expiry.
+  Future<ShareKeyMaterial> createKeyPair();
+
+  /// Returns the key pair whose ID matches [keyId], or null if not found /
+  /// expired.
+  Future<ShareKeyMaterial?> findByKeyId(Uint8List keyId);
+}

lib/core/repositories/sync_log_repository.dart

@@ -4,12 +4,14 @@ class MailboxSyncStats {
     required this.fetched,
     required this.skipped,
     required this.bytesTransferred,
+    this.duration,
   });
 
   final String mailboxPath;
   final int fetched;
   final int skipped;
   final int bytesTransferred;
+  final Duration? duration;
 }
 
 class SyncLogEntry {

lib/core/services/share_encryption_service.dart

@@ -0,0 +1,295 @@
+import 'dart:convert';
+import 'dart:math';
+import 'dart:typed_data';
+
+import 'package:cryptography/cryptography.dart';
+
+const _pubKeyPrefix = 'sharedinbox.de:pubkey:v1:';
+const _encAccountsPrefix = 'sharedinbox.de:encrypted-accounts:v1:';
+
+// ECIES wire sizes (bytes).
+const _keyIdLen = 16;
+const _pubKeyLen = 32;
+const _nonceLen = 12;
+const _macLen = 16;
+
+/// Describes a freshly generated key pair before it is written to the database.
+class ShareKeyMaterial {
+  const ShareKeyMaterial({
+    required this.keyId,
+    required this.publicKeyBytes,
+    required this.privateKeyBytes,
+  });
+
+  /// Random 16-byte identifier (hex-encoded when stored / included in QR).
+  final Uint8List keyId;
+
+  /// X25519 public key, 32 bytes.
+  final Uint8List publicKeyBytes;
+
+  /// X25519 private key, 32 bytes.
+  final Uint8List privateKeyBytes;
+}
+
+/// An account + password pair, used in the plaintext payload before encryption.
+class AccountPayload {
+  const AccountPayload({required this.accountJson, required this.password});
+
+  final Map<String, dynamic> accountJson;
+  final String password;
+}
+
+/// Pure-Dart cryptographic helpers for the secure account-sharing flow.
+///
+/// Protocol:
+///   Receiver generates an X25519 key pair with 20-minute lifetime and shows
+///   its public key as a QR code.  The sender scans that QR, encrypts the
+///   selected account(s) using ECIES (X25519-ECDH + HKDF-SHA256 + AES-256-GCM)
+///   and shows the encrypted payload as a QR code.  The receiver scans that QR,
+///   looks up the private key by the embedded key-ID, and decrypts.
+class ShareEncryptionService {
+  static final _x25519 = X25519();
+  static final _aesGcm = AesGcm.with256bits();
+  static final _hkdf = Hkdf(hmac: Hmac.sha256(), outputLength: 32);
+  static final _rng = Random.secure();
+
+  // ── Key generation ──────────────────────────────────────────────────────────
+
+  static Future<ShareKeyMaterial> generateKeyPair() async {
+    final keyId = Uint8List(_keyIdLen);
+    for (var i = 0; i < _keyIdLen; i++) {
+      keyId[i] = _rng.nextInt(256);
+    }
+
+    final keyPair = await _x25519.newKeyPair();
+    final pub = await keyPair.extractPublicKey();
+    final priv = await keyPair.extractPrivateKeyBytes();
+
+    return ShareKeyMaterial(
+      keyId: keyId,
+      publicKeyBytes: Uint8List.fromList(pub.bytes),
+      privateKeyBytes: Uint8List.fromList(priv),
+    );
+  }
+
+  // ── Public-key QR encoding / parsing ────────────────────────────────────────
+
+  /// Encodes the receiver's public key as a QR-code string.
+  ///
+  /// Format: `sharedinbox.de:pubkey:v1:<base64(keyId[16] || pubKey[32])>`
+  static String encodePublicKeyQr(Uint8List keyId, Uint8List publicKeyBytes) {
+    assert(keyId.length == _keyIdLen);
+    assert(publicKeyBytes.length == _pubKeyLen);
+    final data = Uint8List(_keyIdLen + _pubKeyLen)
+      ..setAll(0, keyId)
+      ..setAll(_keyIdLen, publicKeyBytes);
+    return '$_pubKeyPrefix${base64.encode(data)}';
+  }
+
+  /// Parses a public-key QR string.  Returns null if the format is invalid.
+  static ({Uint8List keyId, Uint8List publicKeyBytes})? parsePublicKeyQr(
+    String s,
+  ) {
+    if (!s.startsWith(_pubKeyPrefix)) return null;
+    try {
+      final data =
+          Uint8List.fromList(base64.decode(s.substring(_pubKeyPrefix.length)));
+      if (data.length != _keyIdLen + _pubKeyLen) return null;
+      return (
+        keyId: data.sublist(0, _keyIdLen),
+        publicKeyBytes: data.sublist(_keyIdLen),
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  // ── Encryption ───────────────────────────────────────────────────────────────
+
+  /// Encrypts [accounts] for the given recipient key pair using ECIES.
+  ///
+  /// Returns the QR-code string to show on the sender device.
+  ///
+  /// Wire format (base64-encoded):
+  ///   keyId[16] || ephPubKey[32] || nonce[12] || ciphertext || mac[16]
+  static Future<String> encryptAccounts({
+    required Uint8List recipientKeyId,
+    required Uint8List recipientPublicKeyBytes,
+    required List<AccountPayload> accounts,
+  }) async {
+    // Build plaintext JSON.
+    final plaintext = utf8.encode(
+      jsonEncode({
+        'v': 2,
+        'issuedAt': DateTime.now().toUtc().toIso8601String(),
+        'accounts': accounts
+            .map((a) => {'account': a.accountJson, 'password': a.password})
+            .toList(),
+      }),
+    );
+
+    // Ephemeral sender key pair for forward-secrecy.
+    final ephKeyPair = await _x25519.newKeyPair();
+    final ephPub = await ephKeyPair.extractPublicKey();
+
+    // ECDH: shared secret = X25519(ephPriv, recipientPub).
+    final sharedSecret = await _x25519.sharedSecretKey(
+      keyPair: ephKeyPair,
+      remotePublicKey: SimplePublicKey(
+        recipientPublicKeyBytes,
+        type: KeyPairType.x25519,
+      ),
+    );
+
+    // Derive AES key via HKDF-SHA256.
+    final aesKey = await _hkdf.deriveKey(
+      secretKey: sharedSecret,
+      nonce: recipientKeyId,
+      info: utf8.encode('sharedinbox-account-transfer'),
+    );
+
+    // Encrypt with AES-256-GCM.
+    final nonce = Uint8List(_nonceLen);
+    for (var i = 0; i < _nonceLen; i++) {
+      nonce[i] = _rng.nextInt(256);
+    }
+
+    final box = await _aesGcm.encrypt(
+      plaintext,
+      secretKey: aesKey,
+      nonce: nonce,
+    );
+
+    // Pack wire format.
+    final ephPubBytes = Uint8List.fromList(ephPub.bytes);
+    final cipherBytes = Uint8List.fromList(box.cipherText);
+    final macBytes = Uint8List.fromList(box.mac.bytes);
+
+    final out = Uint8List(
+      _keyIdLen + _pubKeyLen + _nonceLen + cipherBytes.length + _macLen,
+    )
+      ..setAll(0, recipientKeyId)
+      ..setAll(_keyIdLen, ephPubBytes)
+      ..setAll(_keyIdLen + _pubKeyLen, nonce)
+      ..setAll(_keyIdLen + _pubKeyLen + _nonceLen, cipherBytes)
+      ..setAll(
+        _keyIdLen + _pubKeyLen + _nonceLen + cipherBytes.length,
+        macBytes,
+      );
+
+    return '$_encAccountsPrefix${base64.encode(out)}';
+  }
+
+  // ── Decryption ───────────────────────────────────────────────────────────────
+
+  /// Parses and decrypts an encrypted-accounts QR string.
+  ///
+  /// Throws [FormatException] if the format is invalid.
+  /// Throws [SecretBoxAuthenticationError] if authentication fails (tampered).
+  static Future<List<AccountPayload>> decryptAccounts({
+    required String qrString,
+    required Uint8List privateKeyBytes,
+    required Uint8List publicKeyBytes,
+    required Uint8List keyId,
+  }) async {
+    if (!qrString.startsWith(_encAccountsPrefix)) {
+      throw const FormatException('Not an encrypted-accounts QR code');
+    }
+
+    final Uint8List data;
+    try {
+      data = Uint8List.fromList(
+        base64.decode(qrString.substring(_encAccountsPrefix.length)),
+      );
+    } catch (_) {
+      throw const FormatException('Invalid base64 in encrypted-accounts QR');
+    }
+
+    // Minimum: keyId + ephPubKey + nonce + mac (no ciphertext is valid but odd).
+    if (data.length < _keyIdLen + _pubKeyLen + _nonceLen + _macLen) {
+      throw const FormatException('Encrypted-accounts payload too short');
+    }
+
+    final embeddedKeyId = data.sublist(0, _keyIdLen);
+    // Verify that this payload was encrypted for the right key pair.
+    for (var i = 0; i < _keyIdLen; i++) {
+      if (embeddedKeyId[i] != keyId[i]) {
+        throw const FormatException(
+          'Key ID mismatch — please scan a fresh public-key QR code',
+        );
+      }
+    }
+
+    final ephPubBytes = data.sublist(_keyIdLen, _keyIdLen + _pubKeyLen);
+    final nonce = data.sublist(
+      _keyIdLen + _pubKeyLen,
+      _keyIdLen + _pubKeyLen + _nonceLen,
+    );
+    final cipherText = data.sublist(
+      _keyIdLen + _pubKeyLen + _nonceLen,
+      data.length - _macLen,
+    );
+    final mac = data.sublist(data.length - _macLen);
+
+    // Reconstruct key pair.
+    final keyPair = SimpleKeyPairData(
+      privateKeyBytes,
+      publicKey: SimplePublicKey(publicKeyBytes, type: KeyPairType.x25519),
+      type: KeyPairType.x25519,
+    );
+
+    // ECDH.
+    final sharedSecret = await _x25519.sharedSecretKey(
+      keyPair: keyPair,
+      remotePublicKey: SimplePublicKey(ephPubBytes, type: KeyPairType.x25519),
+    );
+
+    // Re-derive AES key.
+    final aesKey = await _hkdf.deriveKey(
+      secretKey: sharedSecret,
+      nonce: keyId,
+      info: utf8.encode('sharedinbox-account-transfer'),
+    );
+
+    // Decrypt — throws SecretBoxAuthenticationError if tampered.
+    final plaintext = await _aesGcm.decrypt(
+      SecretBox(cipherText, nonce: nonce, mac: Mac(mac)),
+      secretKey: aesKey,
+    );
+
+    // Parse JSON.
+    final Map<String, dynamic> json;
+    try {
+      json = jsonDecode(utf8.decode(plaintext)) as Map<String, dynamic>;
+    } catch (_) {
+      throw const FormatException('Decrypted payload is not valid JSON');
+    }
+
+    if ((json['v'] as int?) != 2) {
+      throw const FormatException('Unsupported encrypted-accounts version');
+    }
+
+    // Verify issuedAt is within 20 minutes.
+    final issuedAtRaw = json['issuedAt'] as String?;
+    if (issuedAtRaw != null) {
+      final issuedAt = DateTime.tryParse(issuedAtRaw);
+      if (issuedAt != null) {
+        final age = DateTime.now().toUtc().difference(issuedAt.toUtc());
+        if (age.abs() > const Duration(minutes: 20)) {
+          throw const FormatException(
+            'The encrypted payload has expired (older than 20 minutes)',
+          );
+        }
+      }
+    }
+
+    final rawAccounts = json['accounts'] as List<dynamic>;
+    return rawAccounts.map((entry) {
+      final m = entry as Map<String, dynamic>;
+      return AccountPayload(
+        accountJson: m['account'] as Map<String, dynamic>,
+        password: m['password'] as String,
+      );
+    }).toList();
+  }
+}

lib/core/services/undo_service.dart

@@ -26,10 +26,10 @@ class UndoService extends StateNotifier<List<UndoAction>> {
     final newList = [...state, action];
     if (newList.length > _maxHistory) {
       final removed = newList.removeAt(0);
-      unawaited(_ref.read(undoRepositoryProvider).deleteAction(removed.id));
+      await _ref.read(undoRepositoryProvider).deleteAction(removed.id);
     }
     state = newList;
-    unawaited(_ref.read(undoRepositoryProvider).saveAction(action));
+    await _ref.read(undoRepositoryProvider).saveAction(action);
   }
 
   Future<void> clear() async {
@@ -45,17 +45,17 @@ class UndoService extends StateNotifier<List<UndoAction>> {
     final UndoAction action;
     if (actionId == null) {
       action = state.last;
-      state = state.sublist(0, state.length - 1);
     } else {
       try {
         action = state.firstWhere((a) => a.id == actionId);
-        state = state.where((a) => a.id != actionId).toList();
       } catch (e) {
         return; // Action not found
       }
     }
 
-    unawaited(_ref.read(undoRepositoryProvider).deleteAction(action.id));
+    // Keep the original entry in state and DB so the user can see what
+    // happened and retry if the undo failed (e.g. after an IMAP sync reverted
+    // the local change). The inverse action added below allows undoing the undo.
 
     final repo = _ref.read(emailRepositoryProvider);
 
@@ -70,10 +70,22 @@ class UndoService extends StateNotifier<List<UndoAction>> {
             ? null
             : action.originalEmails.where((e) => e.id == id).firstOrNull;
 
-        // 2. If row is missing (hard delete), restore it first.
-        // We restore it at its CURRENT state (where it is on the server,
-        // or where it was moving to).
-        if (original != null) {
+        // 2. Resolve the current DB row for the email.
+        // For IMAP, after a server-applied move the email gets a new UID, so
+        // the original id ('accountId:oldUid') no longer exists. Look it up by
+        // Message-ID so we use the correct UID in the pending change.
+        var currentEmail = await repo.getEmail(id);
+        if (currentEmail == null && original?.messageId != null) {
+          currentEmail = await repo.findEmailByMessageId(
+            action.accountId,
+            original!.messageId!,
+          );
+        }
+        final currentId = currentEmail?.id ?? id;
+
+        // 3. If the row is absent (hard delete or UID changed after sync),
+        // restore it from the saved snapshot so moveEmail can find it.
+        if (currentEmail == null && original != null) {
           final currentPath = cancelled
               ? action.sourceMailboxPath
               : (action.destinationMailboxPath ?? action.sourceMailboxPath);
@@ -82,19 +94,40 @@ class UndoService extends StateNotifier<List<UndoAction>> {
           ]);
         }
 
-        // 3. Move it back to source.
+        // 4. Move it back to source.
         // This updates local DB optimistically and (if not cancelled) enqueues
-        // a reverse move on the server.
-        await repo.moveEmail(id, action.sourceMailboxPath);
+        // a reverse move on the server using the correct UID.
+        await repo.moveEmail(currentId, action.sourceMailboxPath);
 
         if (cancelled) {
-          // 4. If we successfully cancelled the original, the reverse move
+          // 5. If we successfully cancelled the original, the reverse move
           // we just enqueued is redundant.
-          await repo.cancelPendingChange(id, 'move');
+          await repo.cancelPendingChange(currentId, 'move');
         }
       } catch (e) {
         // Best effort.
       }
     }
+
+    // Add a reverse action so the undo log always retains a record and the
+    // user can re-apply the original operation. sourceMailboxPath on the
+    // inverse is the original destination (e.g. Trash) so that undoing the
+    // inverse moves emails back there; destinationMailboxPath records where
+    // they are now (the original source, e.g. INBOX).
+    final inverseDest = action.destinationMailboxPath;
+    if (inverseDest != null) {
+      await pushAction(
+        UndoAction(
+          id: '${action.id}-inv',
+          accountId: action.accountId,
+          type: UndoType.move,
+          emailIds: action.emailIds,
+          sourceMailboxPath: inverseDest,
+          destinationMailboxPath: action.sourceMailboxPath,
+          originalEmails: action.originalEmails,
+          timestamp: DateTime.now(),
+        ),
+      );
+    }
   }
 }

lib/core/services/update_service.dart

@@ -0,0 +1,42 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:http/http.dart' as http;
+
+const _kAppVersion = String.fromEnvironment('GIT_HASH');
+const _kLatestJsonUrl = 'https://sharedinbox.de/latest.json';
+
+class UpdateInfo {
+  const UpdateInfo({required this.latestVersion, required this.downloadUrl});
+
+  final String latestVersion;
+  final String downloadUrl;
+}
+
+/// Returns an [UpdateInfo] when a newer Linux or Windows version is available,
+/// or null if the app is up to date, the version is unknown, or the platform
+/// is not a supported desktop.
+final updateInfoProvider = FutureProvider<UpdateInfo?>((ref) async {
+  final platformKey = Platform.isLinux
+      ? 'linux'
+      : Platform.isWindows
+          ? 'windows'
+          : null;
+  if (platformKey == null || _kAppVersion.isEmpty) return null;
+
+  try {
+    final resp = await http
+        .get(Uri.parse(_kLatestJsonUrl))
+        .timeout(const Duration(seconds: 10));
+    if (resp.statusCode != 200) return null;
+    final json = jsonDecode(resp.body) as Map<String, dynamic>;
+    final latest = json['version'] as String?;
+    final url = json[platformKey] as String?;
+    if (latest == null || url == null) return null;
+    if (latest == _kAppVersion) return null;
+    return UpdateInfo(latestVersion: latest, downloadUrl: url);
+  } catch (_) {
+    return null;
+  }
+});

lib/core/sieve/sieve_actions.dart

@@ -0,0 +1,17 @@
+sealed class SieveAction {}
+
+final class FileIntoAction extends SieveAction {
+  FileIntoAction(this.folder);
+  final String folder;
+}
+
+final class KeepAction extends SieveAction {}
+
+final class DiscardAction extends SieveAction {}
+
+final class MarkAsSeenAction extends SieveAction {}
+
+final class FlagAction extends SieveAction {
+  FlagAction(this.flags);
+  final List<String> flags;
+}

lib/core/sieve/sieve_conditions.dart

@@ -0,0 +1,14 @@
+sealed class SieveCondition {}
+
+final class HeaderCondition extends SieveCondition {
+  HeaderCondition(this.headers, this.matchType, this.keyList);
+  final List<String> headers;
+  final String matchType; // ':contains', ':is', ':matches'
+  final List<String> keyList;
+}
+
+final class SizeCondition extends SieveCondition {
+  SizeCondition(this.comparison, this.bytes);
+  final String comparison; // ':over' or ':under'
+  final int bytes;
+}

lib/core/sieve/sieve_interpreter.dart

@@ -0,0 +1,135 @@
+import 'package:sharedinbox/core/sieve/sieve_actions.dart';
+import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
+import 'package:sharedinbox/core/sieve/sieve_rule.dart';
+
+/// A lightweight email representation used by [SieveInterpreter].
+/// Header names are lower-cased.
+class SieveEmailContext {
+  const SieveEmailContext({required this.headers, this.sizeBytes = 0});
+
+  final Map<String, List<String>> headers;
+  final int sizeBytes;
+
+  List<String> getHeader(String name) =>
+      headers[name.toLowerCase()] ?? const [];
+}
+
+/// Tracks the outcome of running a Sieve script against one email.
+class SieveExecutionContext {
+  bool isCancelled = false;
+  Set<String> targetFolders = {};
+  Set<String> flagsToAdd = {};
+  bool keepInInbox = true;
+}
+
+/// Evaluates a compiled list of [SieveRule]s against a [SieveEmailContext].
+class SieveInterpreter {
+  /// Executes [rules] and returns the resulting [SieveExecutionContext].
+  ///
+  /// Rules produced by [SieveParser] may carry a [SieveRule.branchGroupId]
+  /// to represent if/elsif/else chains; at most one branch per group fires.
+  SieveExecutionContext execute(
+    List<SieveRule> rules,
+    SieveEmailContext email,
+  ) {
+    final ctx = SieveExecutionContext();
+    final firedGroups = <int>{};
+
+    for (final rule in rules) {
+      if (ctx.isCancelled) break;
+
+      final groupId = rule.branchGroupId;
+      if (groupId != null && firedGroups.contains(groupId)) continue;
+
+      bool matches;
+      if (rule.isElseBranch) {
+        matches = true; // else fires unconditionally (group not yet consumed)
+      } else {
+        matches = _evaluateConditions(rule, email);
+      }
+
+      if (matches) {
+        _applyActions(rule.actions, ctx);
+        if (groupId != null) firedGroups.add(groupId);
+        if (ctx.isCancelled) break;
+      }
+    }
+
+    // Implicit keep: if no fileinto/discard was reached, email stays in inbox.
+    return ctx;
+  }
+
+  bool _evaluateConditions(SieveRule rule, SieveEmailContext email) {
+    if (rule.conditions.isEmpty) return true;
+    return switch (rule.joinType) {
+      'allof' => rule.conditions.every((c) => _evalCondition(c, email)),
+      'anyof' => rule.conditions.any((c) => _evalCondition(c, email)),
+      _ => rule.conditions.length == 1 &&
+          _evalCondition(rule.conditions.first, email),
+    };
+  }
+
+  bool _evalCondition(SieveCondition cond, SieveEmailContext email) {
+    return switch (cond) {
+      final HeaderCondition c => _evalHeader(c, email),
+      final SizeCondition c => _evalSize(c, email),
+    };
+  }
+
+  bool _evalHeader(HeaderCondition cond, SieveEmailContext email) {
+    for (final header in cond.headers) {
+      final values = email.getHeader(header);
+      for (final value in values) {
+        for (final key in cond.keyList) {
+          if (_matchString(value, cond.matchType, key)) return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  bool _evalSize(SizeCondition cond, SieveEmailContext email) {
+    return switch (cond.comparison) {
+      ':over' => email.sizeBytes > cond.bytes,
+      ':under' => email.sizeBytes < cond.bytes,
+      _ => false,
+    };
+  }
+
+  bool _matchString(String value, String matchType, String key) {
+    final v = value.toLowerCase();
+    final k = key.toLowerCase();
+    return switch (matchType) {
+      ':contains' => k.isEmpty || v.contains(k),
+      ':is' => v == k,
+      ':matches' => _globMatch(v, k),
+      _ => false,
+    };
+  }
+
+  bool _globMatch(String value, String pattern) {
+    final regexStr =
+        RegExp.escape(pattern).replaceAll(r'\*', '.*').replaceAll(r'\?', '.');
+    return RegExp('^$regexStr\$').hasMatch(value);
+  }
+
+  void _applyActions(List<SieveAction> actions, SieveExecutionContext ctx) {
+    for (final action in actions) {
+      switch (action) {
+        case final FileIntoAction a:
+          ctx.targetFolders.add(a.folder);
+          ctx.keepInInbox = false;
+        case DiscardAction():
+          ctx.isCancelled = true;
+          ctx.keepInInbox = false;
+          return;
+        case KeepAction():
+          ctx.keepInInbox = true;
+        case MarkAsSeenAction():
+          ctx.flagsToAdd.add(r'\Seen');
+        case final FlagAction a:
+          ctx.flagsToAdd.addAll(a.flags);
+      }
+    }
+  }
+}

lib/core/sieve/sieve_parser.dart

@@ -0,0 +1,593 @@
+import 'package:sharedinbox/core/sieve/sieve_actions.dart';
+import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
+import 'package:sharedinbox/core/sieve/sieve_rule.dart';
+
+/// Parses a Sieve script (RFC 5228 subset) into a flat list of [SieveRule]s.
+///
+/// Supported commands: require, if, elsif, else, fileinto, keep, discard,
+/// flag, setflag, addflag, stop.
+/// Supported tests: header, address, size, exists, allof, anyof, not, true.
+/// Supported match types: :contains, :is, :matches.
+class SieveParser {
+  List<SieveRule> parse(String script) {
+    final scanner = _Scanner(script);
+    final rules = <SieveRule>[];
+    _parseStatements(scanner, rules);
+    return rules;
+  }
+
+  void _parseStatements(_Scanner s, List<SieveRule> out) {
+    while (!s.isAtEnd) {
+      s.skipWhitespaceAndComments();
+      if (s.isAtEnd) break;
+
+      final word = s.peekWord();
+      if (word == null) break;
+
+      if (word == 'require') {
+        _parseRequire(s);
+      } else if (word == 'if') {
+        _parseIf(s, out);
+      } else if (word == 'elsif' || word == 'else') {
+        // Reached by _parseIf, should not appear at top level.
+        break;
+      } else if (word == '}') {
+        break;
+      } else {
+        final action = _tryParseAction(s);
+        if (action != null) {
+          out.add(
+            SieveRule(
+              joinType: 'single',
+              conditions: const [],
+              actions: [action],
+            ),
+          );
+        } else {
+          s.skipToNextSemicolon();
+        }
+      }
+    }
+  }
+
+  void _parseRequire(_Scanner s) {
+    s.expectWord('require');
+    s.skipWhitespaceAndComments();
+    _parseStringOrList(s); // discard capability list
+    s.skipWhitespaceAndComments();
+    s.expectChar(';');
+  }
+
+  // Monotonically increasing id shared per parse run, threaded via closure.
+  int _groupCounter = 0;
+
+  void _parseIf(_Scanner s, List<SieveRule> out) {
+    final groupId = ++_groupCounter;
+
+    s.expectWord('if');
+    s.skipWhitespaceAndComments();
+    final (joinType, conditions) = _parseTest(s);
+    s.skipWhitespaceAndComments();
+    final ifActions = _parseBlock(s);
+
+    out.add(
+      SieveRule(
+        joinType: joinType,
+        conditions: conditions,
+        actions: ifActions,
+        branchGroupId: groupId,
+      ),
+    );
+
+    // Parse zero or more elsif branches.
+    while (true) {
+      s.skipWhitespaceAndComments();
+      if (s.peekWord() != 'elsif') break;
+      s.expectWord('elsif');
+      s.skipWhitespaceAndComments();
+      final (ej, ec) = _parseTest(s);
+      s.skipWhitespaceAndComments();
+      final elsifActions = _parseBlock(s);
+      out.add(
+        SieveRule(
+          joinType: ej,
+          conditions: ec,
+          actions: elsifActions,
+          branchGroupId: groupId,
+        ),
+      );
+    }
+
+    // Optional else branch.
+    s.skipWhitespaceAndComments();
+    if (s.peekWord() == 'else') {
+      s.expectWord('else');
+      s.skipWhitespaceAndComments();
+      final elseActions = _parseBlock(s);
+      out.add(
+        SieveRule(
+          joinType: 'single',
+          conditions: const [],
+          actions: elseActions,
+          branchGroupId: groupId,
+          isElseBranch: true,
+        ),
+      );
+    }
+  }
+
+  List<SieveAction> _parseBlock(_Scanner s) {
+    s.expectChar('{');
+    final blockRules = <SieveRule>[];
+    _parseStatements(s, blockRules);
+    s.skipWhitespaceAndComments();
+    s.expectChar('}');
+    return blockRules.expand((r) => r.actions).toList();
+  }
+
+  /// Returns (joinType, conditions).
+  (String, List<SieveCondition>) _parseTest(_Scanner s) {
+    s.skipWhitespaceAndComments();
+    final word = s.peekWord();
+
+    if (word == 'allof' || word == 'anyof') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      s.expectChar('(');
+      final conditions = <SieveCondition>[];
+      while (true) {
+        s.skipWhitespaceAndComments();
+        if (s.peek() == ')') break;
+        final (_, conds) = _parseTest(s);
+        conditions.addAll(conds);
+        s.skipWhitespaceAndComments();
+        if (s.peek() == ',') {
+          s.advance();
+        } else {
+          break;
+        }
+      }
+      s.skipWhitespaceAndComments();
+      s.expectChar(')');
+      return (word!, conditions);
+    }
+
+    final cond = _parseSingleTest(s);
+    return ('single', cond != null ? [cond] : []);
+  }
+
+  SieveCondition? _parseSingleTest(_Scanner s) {
+    s.skipWhitespaceAndComments();
+    final word = s.peekWord()?.toLowerCase();
+    if (word == null) return null;
+
+    if (word == 'not') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      // Negation is not represented in the flat rule model; the caller
+      // should handle the negated condition separately. For now we parse
+      // and return the inner condition unchanged (best-effort for this subset).
+      return _parseSingleTest(s);
+    }
+
+    if (word == 'true') {
+      s.readWord();
+      return null; // no condition = always matches
+    }
+
+    if (word == 'header' || word == 'address') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      final matchType = _parseMatchType(s);
+      s.skipWhitespaceAndComments();
+      // Consume optional :comparator "..." tagged argument.
+      if (s.peekTaggedArg() == ':comparator') {
+        s.readWord();
+        s.skipWhitespaceAndComments();
+        _parseStringOrList(s); // discard comparator value
+        s.skipWhitespaceAndComments();
+      }
+      final headers = _parseStringOrList(s);
+      s.skipWhitespaceAndComments();
+      final keys = _parseStringOrList(s);
+      return HeaderCondition(headers, matchType, keys);
+    }
+
+    if (word == 'exists') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      final headers = _parseStringOrList(s);
+      // Represent exists as :contains "" so any non-empty value matches.
+      return HeaderCondition(headers, ':contains', const ['']);
+    }
+
+    if (word == 'size') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      final comp = s.readTaggedArg(); // :over or :under
+      s.skipWhitespaceAndComments();
+      final bytes = _parseSizeNumber(s);
+      return SizeCondition(comp, bytes);
+    }
+
+    // Unknown test — skip to closing paren or brace.
+    s.readWord();
+    return null;
+  }
+
+  String _parseMatchType(_Scanner s) {
+    s.skipWhitespaceAndComments();
+    final tag = s.peekTaggedArg();
+    if (tag == ':contains' || tag == ':is' || tag == ':matches') {
+      s.readWord();
+      return tag!;
+    }
+    // Default per RFC 5228 is :is.
+    return ':is';
+  }
+
+  List<String> _parseStringOrList(_Scanner s) {
+    s.skipWhitespaceAndComments();
+    if (s.peek() == '[') {
+      s.advance(); // consume '['
+      final items = <String>[];
+      while (true) {
+        s.skipWhitespaceAndComments();
+        if (s.peek() == ']') {
+          s.advance();
+          break;
+        }
+        items.add(_parseString(s));
+        s.skipWhitespaceAndComments();
+        if (s.peek() == ',') {
+          s.advance();
+        }
+      }
+      return items;
+    }
+    return [_parseString(s)];
+  }
+
+  String _parseString(_Scanner s) {
+    s.skipWhitespaceAndComments();
+    if (s.peek() == '"') {
+      return s.readQuotedString();
+    }
+    // Multi-line text: text:...\r\n.\r\n  (RFC 5228 §2.4.2)
+    if (s.peekWord()?.toLowerCase() == 'text:') {
+      return s.readTextBlock();
+    }
+    throw SieveParseException(
+      'Expected string at position ${s.position}: "${s.remaining.substring(0, 20)}"',
+    );
+  }
+
+  int _parseSizeNumber(_Scanner s) {
+    final digits = s.readDigits();
+    final value = int.parse(digits);
+    final unit = s.peekSizeUnit();
+    if (unit != null) {
+      s.advance();
+      return switch (unit.toUpperCase()) {
+        'K' => value * 1024,
+        'M' => value * 1024 * 1024,
+        'G' => value * 1024 * 1024 * 1024,
+        _ => value,
+      };
+    }
+    return value;
+  }
+
+  SieveAction? _tryParseAction(_Scanner s) {
+    s.skipWhitespaceAndComments();
+    final word = s.peekWord()?.toLowerCase();
+    if (word == null) return null;
+
+    if (word == 'fileinto') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      final folder = _parseString(s);
+      s.skipWhitespaceAndComments();
+      s.expectChar(';');
+      return FileIntoAction(folder);
+    }
+    if (word == 'keep') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      s.expectChar(';');
+      return KeepAction();
+    }
+    if (word == 'discard') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      s.expectChar(';');
+      return DiscardAction();
+    }
+    if (word == 'stop') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      s.expectChar(';');
+      return KeepAction(); // stop with no prior action = implicit keep
+    }
+    if (word == 'flag' || word == 'setflag' || word == 'addflag') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      // Optional variable name (string arg before the flag list).
+      final peek = s.peek();
+      List<String> flags;
+      if (peek == '"') {
+        final first = _parseString(s);
+        s.skipWhitespaceAndComments();
+        if (s.peek() == '[' || s.peek() == '"') {
+          // first was the variable name, next is the flag list
+          flags = _parseStringOrList(s);
+        } else {
+          flags = [first];
+        }
+      } else {
+        flags = _parseStringOrList(s);
+      }
+      s.skipWhitespaceAndComments();
+      s.expectChar(';');
+      if (flags.any(
+        (f) => f.toLowerCase() == r'\seen' || f.toLowerCase() == r'\\seen',
+      )) {
+        return MarkAsSeenAction();
+      }
+      return FlagAction(flags);
+    }
+    if (word == 'mark') {
+      s.readWord();
+      s.skipWhitespaceAndComments();
+      s.expectChar(';');
+      return MarkAsSeenAction();
+    }
+    return null;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Low-level scanner
+// ---------------------------------------------------------------------------
+
+class SieveParseException implements Exception {
+  SieveParseException(this.message);
+  final String message;
+  @override
+  String toString() => 'SieveParseException: $message';
+}
+
+class _Scanner {
+  _Scanner(this._src);
+
+  final String _src;
+  int _pos = 0;
+
+  int get position => _pos;
+  bool get isAtEnd => _pos >= _src.length;
+  String get remaining => _pos < _src.length ? _src.substring(_pos) : '';
+
+  String? peek() {
+    if (isAtEnd) return null;
+    return _src[_pos];
+  }
+
+  String advance() {
+    if (isAtEnd) throw SieveParseException('Unexpected end of input');
+    return _src[_pos++];
+  }
+
+  void skipWhitespaceAndComments() {
+    while (!isAtEnd) {
+      final ch = _src[_pos];
+      if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n') {
+        _pos++;
+      } else if (ch == '#') {
+        // Line comment — skip to end of line.
+        while (!isAtEnd && _src[_pos] != '\n') {
+          _pos++;
+        }
+      } else if (_pos + 1 < _src.length && ch == '/' && _src[_pos + 1] == '*') {
+        // Block comment.
+        _pos += 2;
+        while (_pos + 1 < _src.length) {
+          if (_src[_pos] == '*' && _src[_pos + 1] == '/') {
+            _pos += 2;
+            break;
+          }
+          _pos++;
+        }
+      } else {
+        break;
+      }
+    }
+  }
+
+  /// Peeks at the next word-like token (letters/digits/underscores/colons for
+  /// tagged args, and special single-char tokens like `{`, `}`, `;`).
+  String? peekWord() {
+    if (isAtEnd) return null;
+    final ch = _src[_pos];
+    if ('{}();[],'.contains(ch)) return ch;
+    if (ch == ':') {
+      // Tagged arg like :contains
+      final start = _pos;
+      var end = _pos + 1;
+      while (end < _src.length && _isWordChar(_src[end])) {
+        end++;
+      }
+      return _src.substring(start, end).toLowerCase();
+    }
+    if (_isWordChar(ch)) {
+      final start = _pos;
+      var end = _pos + 1;
+      while (
+          end < _src.length && (_isWordChar(_src[end]) || _src[end] == ':')) {
+        // Include trailing colon for "text:" multiline token.
+        if (_src[end] == ':') {
+          end++;
+          break;
+        }
+        end++;
+      }
+      return _src.substring(start, end).toLowerCase();
+    }
+    return null;
+  }
+
+  String readWord() {
+    final start = _pos;
+    final ch = _src[_pos];
+    if ('{}();[],'.contains(ch)) {
+      _pos++;
+      return ch;
+    }
+    if (ch == ':') {
+      _pos++;
+      while (!isAtEnd && _isWordChar(_src[_pos])) {
+        _pos++;
+      }
+    } else {
+      while (!isAtEnd && (_isWordChar(_src[_pos]) || _src[_pos] == ':')) {
+        if (_src[_pos] == ':') {
+          _pos++;
+          break;
+        }
+        _pos++;
+      }
+    }
+    return _src.substring(start, _pos).toLowerCase();
+  }
+
+  String? peekTaggedArg() {
+    if (!isAtEnd && _src[_pos] == ':') return peekWord();
+    return null;
+  }
+
+  String readTaggedArg() {
+    if (!isAtEnd && _src[_pos] == ':') return readWord();
+    throw SieveParseException(
+      'Expected tagged argument at position $_pos',
+    );
+  }
+
+  String? peekSizeUnit() {
+    if (isAtEnd) return null;
+    final ch = _src[_pos].toUpperCase();
+    if (ch == 'K' || ch == 'M' || ch == 'G') return ch;
+    return null;
+  }
+
+  String readDigits() {
+    if (isAtEnd || !_isDigit(_src[_pos])) {
+      throw SieveParseException(
+        'Expected number at position $_pos',
+      );
+    }
+    final start = _pos;
+    while (!isAtEnd && _isDigit(_src[_pos])) {
+      _pos++;
+    }
+    return _src.substring(start, _pos);
+  }
+
+  String readQuotedString() {
+    if (_src[_pos] != '"') {
+      throw SieveParseException(
+        'Expected " at position $_pos',
+      );
+    }
+    _pos++; // skip opening quote
+    final buf = StringBuffer();
+    while (!isAtEnd) {
+      final ch = _src[_pos];
+      if (ch == '"') {
+        _pos++;
+        return buf.toString();
+      }
+      if (ch == '\\' && _pos + 1 < _src.length) {
+        _pos++;
+        buf.write(_src[_pos]);
+        _pos++;
+      } else {
+        buf.write(ch);
+        _pos++;
+      }
+    }
+    throw SieveParseException('Unterminated string');
+  }
+
+  /// Parses a `text:` multi-line block (RFC 5228 §2.4.2).
+  /// Format: `text:\r\n<lines>\r\n.\r\n`
+  String readTextBlock() {
+    // Consume "text:"
+    while (!isAtEnd && _src[_pos] != ':') {
+      _pos++;
+    }
+    if (!isAtEnd) _pos++; // skip ':'
+    // Skip optional whitespace then newline.
+    while (!isAtEnd && (_src[_pos] == ' ' || _src[_pos] == '\t')) {
+      _pos++;
+    }
+    if (!isAtEnd && _src[_pos] == '\r') _pos++;
+    if (!isAtEnd && _src[_pos] == '\n') _pos++;
+    final buf = StringBuffer();
+    while (!isAtEnd) {
+      // Check for terminator: a lone "." on its own line.
+      if (_src[_pos] == '.' &&
+          (_pos + 1 >= _src.length ||
+              _src[_pos + 1] == '\r' ||
+              _src[_pos + 1] == '\n')) {
+        _pos++;
+        if (!isAtEnd && _src[_pos] == '\r') _pos++;
+        if (!isAtEnd && _src[_pos] == '\n') _pos++;
+        break;
+      }
+      buf.write(_src[_pos]);
+      _pos++;
+    }
+    return buf.toString();
+  }
+
+  void expectChar(String ch) {
+    skipWhitespaceAndComments();
+    if (isAtEnd || _src[_pos] != ch) {
+      throw SieveParseException(
+        'Expected "$ch" at position $_pos, got '
+        '"${isAtEnd ? "EOF" : _src[_pos]}"',
+      );
+    }
+    _pos++;
+  }
+
+  void expectWord(String word) {
+    skipWhitespaceAndComments();
+    final got = readWord();
+    if (got.toLowerCase() != word.toLowerCase()) {
+      throw SieveParseException(
+        'Expected "$word" at position $_pos, got "$got"',
+      );
+    }
+  }
+
+  void skipToNextSemicolon() {
+    while (!isAtEnd && _src[_pos] != ';') {
+      _pos++;
+    }
+    if (!isAtEnd) _pos++; // skip ';'
+  }
+
+  static bool _isWordChar(String ch) {
+    final c = ch.codeUnitAt(0);
+    return (c >= 0x41 && c <= 0x5A) || // A-Z
+        (c >= 0x61 && c <= 0x7A) || // a-z
+        (c >= 0x30 && c <= 0x39) || // 0-9
+        c == 0x5F || // _
+        c == 0x2D; // -
+  }
+
+  static bool _isDigit(String ch) {
+    final c = ch.codeUnitAt(0);
+    return c >= 0x30 && c <= 0x39;
+  }
+}

lib/core/sieve/sieve_rule.dart

@@ -0,0 +1,21 @@
+import 'package:sharedinbox/core/sieve/sieve_actions.dart';
+import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
+
+class SieveRule {
+  const SieveRule({
+    required this.joinType,
+    required this.conditions,
+    required this.actions,
+    this.branchGroupId,
+    this.isElseBranch = false,
+  });
+
+  // 'allof', 'anyof', or 'single'
+  final String joinType;
+  final List<SieveCondition> conditions;
+  final List<SieveAction> actions;
+  // Non-null groups this rule into an if/elsif/else chain.
+  final int? branchGroupId;
+  // True for the unconditional else branch.
+  final bool isElseBranch;
+}

lib/core/sync/account_sync_manager.dart

@@ -11,6 +11,7 @@ import 'package:sharedinbox/core/repositories/sync_log_repository.dart';
 import 'package:sharedinbox/core/utils/logger.dart';
 import 'package:sharedinbox/data/imap/imap_client_factory.dart'
     show ImapConnectFn, connectImap, verboseLogKey;
+import 'package:sharedinbox/data/imap/tls_error.dart' show isTlsConfigError;
 
 typedef OnNewMailCallback = Future<void> Function(String accountEmail);
 
@@ -200,6 +201,7 @@ class _AccountSync implements _SyncLoop {
   bool _running = false;
   int _backoffSeconds = 5;
   Completer<void>? _stopSignal;
+  Timer? _waitTimer;
 
   @override
   void start() {
@@ -291,6 +293,7 @@ class _AccountSync implements _SyncLoop {
   }
 
   bool _isPermanentError(Object e) {
+    if (isTlsConfigError(e)) return true;
     final s = e.toString().toLowerCase();
     // enough_mail doesn't always have typed exceptions for auth, so we check strings.
     return s.contains('invalid credentials') ||
@@ -301,11 +304,16 @@ class _AccountSync implements _SyncLoop {
   Future<void> _waitSeconds(int seconds) async {
     if (!_running) return;
     _stopSignal = Completer<void>();
-    await Future.any([
-      Future.delayed(Duration(seconds: seconds)),
-      _stopSignal!.future,
-    ]);
-    _stopSignal = null;
+    _waitTimer = Timer(Duration(seconds: seconds), () {
+      if (!_stopSignal!.isCompleted) _stopSignal!.complete();
+    });
+    try {
+      await _stopSignal!.future;
+    } finally {
+      _waitTimer?.cancel();
+      _waitTimer = null;
+      _stopSignal = null;
+    }
   }
 
   Future<(_SyncStats, String?)> _runSync(bool verbose) async {
@@ -339,6 +347,7 @@ class _AccountSync implements _SyncLoop {
     final mailboxStats = <MailboxSyncStats>[];
     for (final mailbox in mailboxes) {
       if (!_running) break;
+      final mailboxStart = DateTime.now();
       final r = await _emails.syncEmails(account.id, mailbox.path);
       emailResult += r;
       mailboxStats.add(
@@ -347,9 +356,11 @@ class _AccountSync implements _SyncLoop {
           fetched: r.fetched,
           skipped: r.skipped,
           bytesTransferred: r.bytesTransferred,
+          duration: DateTime.now().difference(mailboxStart),
         ),
       );
     }
+    await _emails.applySieveRules(account.id);
     return _SyncStats(
       emailsFetched: emailResult.fetched,
       emailsSkipped: emailResult.skipped,
@@ -392,11 +403,16 @@ class _AccountSync implements _SyncLoop {
 
       // Cap IDLE at 25 minutes (RFC 2177). Also wakes up when stop() is
       // called or a new message / expunge event arrives.
-      await Future.any([
-        newMessageCompleter.future,
-        Future.delayed(const Duration(minutes: 25)),
-        _stopSignal!.future,
-      ]);
+      final idleTimer = Timer(const Duration(minutes: 25), () {
+        if (_stopSignal != null && !_stopSignal!.isCompleted) {
+          _stopSignal!.complete();
+        }
+      });
+      try {
+        await Future.any([newMessageCompleter.future, _stopSignal!.future]);
+      } finally {
+        idleTimer.cancel();
+      }
 
       await client.idleDone();
       await sub.cancel();
@@ -437,6 +453,7 @@ class _JmapAccountSync implements _SyncLoop {
   bool _running = false;
   int _backoffSeconds = 5;
   Completer<void>? _stopSignal;
+  Timer? _waitTimer;
 
   static const _pollInterval = Duration(seconds: 30);
 
@@ -528,6 +545,7 @@ class _JmapAccountSync implements _SyncLoop {
   }
 
   bool _isPermanentError(Object e) {
+    if (isTlsConfigError(e)) return true;
     final s = e.toString().toLowerCase();
     return s.contains('invalid credentials') ||
         s.contains('authentication failed') ||
@@ -539,11 +557,16 @@ class _JmapAccountSync implements _SyncLoop {
   Future<void> _waitSeconds(int seconds) async {
     if (!_running) return;
     _stopSignal = Completer<void>();
-    await Future.any([
-      Future.delayed(Duration(seconds: seconds)),
-      _stopSignal!.future,
-    ]);
-    _stopSignal = null;
+    _waitTimer = Timer(Duration(seconds: seconds), () {
+      if (!_stopSignal!.isCompleted) _stopSignal!.complete();
+    });
+    try {
+      await _stopSignal!.future;
+    } finally {
+      _waitTimer?.cancel();
+      _waitTimer = null;
+      _stopSignal = null;
+    }
   }
 
   Future<(_SyncStats, String?)> _runSync(bool verbose) async {
@@ -578,6 +601,7 @@ class _JmapAccountSync implements _SyncLoop {
     final mailboxStats = <MailboxSyncStats>[];
     for (final mailbox in mailboxes) {
       if (!_running) break;
+      final mailboxStart = DateTime.now();
       final r = await _emails.syncEmails(account.id, mailbox.path);
       emailResult += r;
       mailboxStats.add(
@@ -586,9 +610,11 @@ class _JmapAccountSync implements _SyncLoop {
           fetched: r.fetched,
           skipped: r.skipped,
           bytesTransferred: r.bytesTransferred,
+          duration: DateTime.now().difference(mailboxStart),
         ),
       );
     }
+    await _emails.applySieveRules(account.id);
     return _SyncStats(
       emailsFetched: emailResult.fetched,
       emailsSkipped: emailResult.skipped,
@@ -615,11 +641,16 @@ class _JmapAccountSync implements _SyncLoop {
       onError: (_) {},
     );
 
-    await Future.any([
-      pushReady.future,
-      Future.delayed(_pollInterval),
-      _stopSignal!.future,
-    ]);
+    final pollTimer = Timer(_pollInterval, () {
+      if (_stopSignal != null && !_stopSignal!.isCompleted) {
+        _stopSignal!.complete();
+      }
+    });
+    try {
+      await Future.any([pushReady.future, _stopSignal!.future]);
+    } finally {
+      pollTimer.cancel();
+    }
 
     await pushSub.cancel();
     _stopSignal = null;

lib/core/sync/background_sync.dart

@@ -38,7 +38,7 @@ Future<void> registerBackgroundSync() async {
     _kTaskName,
     frequency: const Duration(minutes: 15),
     constraints: Constraints(networkType: NetworkType.connected),
-    existingWorkPolicy: ExistingWorkPolicy.keep,
+    existingWorkPolicy: ExistingPeriodicWorkPolicy.keep,
   );
 }
 

lib/core/sync/reliability_runner.dart

@@ -50,7 +50,7 @@ class ReliabilityRunner {
     }
   }
 
-  Future<void> _runForAccount(String accountId) async {
+  Future<void> _runForAccount(String accountId, {bool force = false}) async {
     try {
       final mailboxes = await _mailboxes.observeMailboxes(accountId).first;
       var totalMissingLocally = 0;
@@ -59,7 +59,7 @@ class ReliabilityRunner {
       final details = <String, dynamic>{};
 
       for (final mailbox in mailboxes) {
-        if (!_running) break;
+        if (!force && !_running) break;
         final result = await _emails.verifySyncReliability(
           accountId,
           mailbox.path,
@@ -103,7 +103,14 @@ class ReliabilityRunner {
   }
 
   /// Forces a reliability check for all accounts immediately.
+  ///
+  /// Works regardless of whether [start] has been called, so the UI can
+  /// trigger a manual check at any time without depending on the periodic
+  /// runner being active.
   Future<void> checkNow() async {
-    await _runAll();
+    final accounts = await _accounts.observeAccounts().first;
+    for (final account in accounts) {
+      await _runForAccount(account.id, force: true);
+    }
   }
 }

lib/core/utils/cid_utils.dart

@@ -0,0 +1,44 @@
+import 'dart:convert';
+
+import 'package:enough_mail/enough_mail.dart' as imap;
+
+/// Replaces `src="cid:..."` references in [html] with inline `data:` URIs
+/// by looking up each Content-ID in the MIME tree of [msg].
+///
+/// Emails with `multipart/related` often embed images this way.  Without
+/// substitution the WebView shows broken image icons even after the full
+/// message has been downloaded.
+String injectInlineImages(String html, imap.MimeMessage msg) {
+  final inlineParts = msg.findContentInfo(
+    disposition: imap.ContentDisposition.inline,
+  );
+  if (inlineParts.isEmpty) return html;
+
+  var result = html;
+  for (final info in inlineParts) {
+    final cid = info.cid;
+    if (cid == null || cid.isEmpty) continue;
+    final bareCid = cid.startsWith('<') && cid.endsWith('>')
+        ? cid.substring(1, cid.length - 1)
+        : cid;
+
+    final part = msg.getPart(info.fetchId);
+    if (part == null) continue;
+    final bytes = part.decodeContentBinary();
+    if (bytes == null || bytes.isEmpty) continue;
+
+    final contentType =
+        info.contentType?.mediaType.text ?? 'application/octet-stream';
+    final dataUri = 'data:$contentType;base64,${base64.encode(bytes)}';
+
+    result = result
+        .replaceAll('src="cid:$bareCid"', 'src="$dataUri"')
+        .replaceAll("src='cid:$bareCid'", "src='$dataUri'")
+        .replaceAll('src="cid:${bareCid.toLowerCase()}"', 'src="$dataUri"')
+        .replaceAll(
+          "src='cid:${bareCid.toLowerCase()}'",
+          "src='$dataUri'",
+        );
+  }
+  return result;
+}

lib/data/db/database.dart

@@ -107,6 +107,8 @@ class EmailBodies extends Table {
   DateTimeColumn get cachedAt => dateTime().nullable()();
   // Added in schema v20: raw or parsed headers
   TextColumn get headersJson => text().nullable()();
+  // Added in schema v28: serialised MimePart tree (JSON)
+  TextColumn get mimeTreeJson => text().nullable()();
 
   @override
   Set<Column> get primaryKey => {emailId};
@@ -202,6 +204,8 @@ class SyncLogMailboxes extends Table {
   IntColumn get fetched => integer().withDefault(const Constant(0))();
   IntColumn get skipped => integer().withDefault(const Constant(0))();
   IntColumn get bytesTransferred => integer().withDefault(const Constant(0))();
+  // Added in schema v30: how long this mailbox took to sync, in milliseconds.
+  IntColumn get durationMs => integer().nullable()();
 }
 
 /// Stores the result of the periodic "ground truth" verification.
@@ -234,6 +238,42 @@ class Drafts extends Table {
   TextColumn get imapServerId => text().nullable()();
 }
 
+/// Ephemeral public/private key pair generated for secure account sharing.
+/// Expires after 20 minutes; used to decrypt an incoming encrypted-accounts QR.
+@DataClassName('ShareKeyRow')
+class ShareKeys extends Table {
+  /// Random 16-byte key ID, hex-encoded.  Identifies which key pair the sender
+  /// used so the receiver can look it up even if multiple pairs exist.
+  TextColumn get id => text()();
+
+  /// Base64-encoded X25519 public key (32 bytes).
+  TextColumn get publicKey => text()();
+
+  /// Base64-encoded X25519 private key (32 bytes).
+  TextColumn get privateKey => text()();
+  DateTimeColumn get expiresAt => dateTime()();
+
+  @override
+  Set<Column> get primaryKey => {id};
+}
+
+@DataClassName('SearchHistoryRow')
+class SearchHistoryEntries extends Table {
+  IntColumn get id => integer().autoIncrement()();
+  TextColumn get query => text()();
+  DateTimeColumn get searchedAt => dateTime()();
+}
+
+@DataClassName('LocalSieveScriptRow')
+class LocalSieveScripts extends Table {
+  IntColumn get id => integer().autoIncrement()();
+  TextColumn get accountId =>
+      text().references(Accounts, #id, onDelete: KeyAction.cascade)();
+  TextColumn get name => text()();
+  TextColumn get content => text().withDefault(const Constant(''))();
+  BoolColumn get isActive => boolean().withDefault(const Constant(false))();
+}
+
 @DataClassName('UndoActionRow')
 class UndoActions extends Table {
   TextColumn get id => text()();
@@ -247,6 +287,21 @@ class UndoActions extends Table {
   Set<Column> get primaryKey => {id};
 }
 
+/// Records which emails have already had local Sieve rules applied.
+/// Keyed by (accountId, messageId) so the same email is never processed twice,
+/// even across restarts or re-syncs.
+@DataClassName('LocalSieveAppliedRow')
+class LocalSieveApplied extends Table {
+  TextColumn get accountId =>
+      text().references(Accounts, #id, onDelete: KeyAction.cascade)();
+  // RFC 2822 Message-ID header value — stable across folder moves.
+  TextColumn get messageId => text()();
+  DateTimeColumn get appliedAt => dateTime()();
+
+  @override
+  Set<Column> get primaryKey => {accountId, messageId};
+}
+
 // ── Database ──────────────────────────────────────────────────────────────────
 
 @DriftDatabase(
@@ -263,16 +318,57 @@ class UndoActions extends Table {
     SyncLogMailboxes,
     SyncHealth,
     UndoActions,
+    SearchHistoryEntries,
+    LocalSieveScripts,
+    LocalSieveApplied,
+    ShareKeys,
   ],
 )
 class AppDatabase extends _$AppDatabase {
   AppDatabase([QueryExecutor? executor]) : super(executor ?? _openConnection());
 
   @override
-  int get schemaVersion => 25;
+  int get schemaVersion => 32;
+
+  Future<void> _createEmailFts() async {
+    await customStatement('''
+      CREATE VIRTUAL TABLE IF NOT EXISTS email_fts USING fts5(
+        subject, preview, from_json,
+        content='emails',
+        content_rowid='rowid'
+      )
+    ''');
+    await customStatement('''
+      CREATE TRIGGER IF NOT EXISTS email_fts_ai
+      AFTER INSERT ON emails BEGIN
+        INSERT INTO email_fts(rowid, subject, preview, from_json)
+        VALUES (new.rowid, new.subject, new.preview, new.from_json);
+      END
+    ''');
+    await customStatement('''
+      CREATE TRIGGER IF NOT EXISTS email_fts_au
+      AFTER UPDATE OF subject, preview, from_json ON emails BEGIN
+        INSERT INTO email_fts(email_fts, rowid, subject, preview, from_json)
+        VALUES ('delete', old.rowid, old.subject, old.preview, old.from_json);
+        INSERT INTO email_fts(rowid, subject, preview, from_json)
+        VALUES (new.rowid, new.subject, new.preview, new.from_json);
+      END
+    ''');
+    await customStatement('''
+      CREATE TRIGGER IF NOT EXISTS email_fts_ad
+      AFTER DELETE ON emails BEGIN
+        INSERT INTO email_fts(email_fts, rowid, subject, preview, from_json)
+        VALUES ('delete', old.rowid, old.subject, old.preview, old.from_json);
+      END
+    ''');
+  }
 
   @override
   MigrationStrategy get migration => MigrationStrategy(
+        onCreate: (m) async {
+          await m.createAll();
+          await _createEmailFts();
+        },
         onUpgrade: (m, from, to) async {
           // NOTE: m.createTable(T) creates the LATEST version of table T.
           // If you later add a column C to T in version X, you must guard
@@ -447,6 +543,32 @@ class AppDatabase extends _$AppDatabase {
               ),
             );
           }
+          if (from < 26) {
+            await _createEmailFts();
+            // Backfill FTS index from existing rows.
+            await customStatement('''
+              INSERT INTO email_fts(rowid, subject, preview, from_json)
+              SELECT rowid, subject, preview, from_json FROM emails
+            ''');
+          }
+          if (from < 27) {
+            await m.createTable(searchHistoryEntries);
+          }
+          if (from < 28) {
+            await m.addColumn(emailBodies, emailBodies.mimeTreeJson);
+          }
+          if (from < 29) {
+            await m.createTable(localSieveScripts);
+          }
+          if (from >= 12 && from < 30) {
+            await m.addColumn(syncLogMailboxes, syncLogMailboxes.durationMs);
+          }
+          if (from < 31) {
+            await m.createTable(shareKeys);
+          }
+          if (from < 32) {
+            await m.createTable(localSieveApplied);
+          }
         },
       );
 }

lib/data/db/local_sieve_repository.dart

@@ -0,0 +1,101 @@
+import 'package:drift/drift.dart';
+
+import 'package:sharedinbox/core/models/sieve_script.dart';
+import 'package:sharedinbox/data/db/database.dart';
+
+class LocalSieveRepository {
+  LocalSieveRepository(this._db);
+
+  final AppDatabase _db;
+
+  Future<List<SieveScript>> listScripts(String accountId) async {
+    final rows = await (_db.select(_db.localSieveScripts)
+          ..where((t) => t.accountId.equals(accountId)))
+        .get();
+    return rows
+        .map(
+          (r) => SieveScript(
+            id: r.id.toString(),
+            name: r.name,
+            blobId: r.id.toString(),
+            isActive: r.isActive,
+          ),
+        )
+        .toList();
+  }
+
+  Future<String> getScriptContent(String accountId, String blobId) async {
+    final rowId = int.parse(blobId);
+    final row = await (_db.select(_db.localSieveScripts)
+          ..where(
+            (t) => t.id.equals(rowId) & t.accountId.equals(accountId),
+          ))
+        .getSingleOrNull();
+    if (row == null) throw Exception('Local script not found: $blobId');
+    return row.content;
+  }
+
+  Future<SieveScript> saveScript(
+    String accountId, {
+    String? id,
+    required String name,
+    required String content,
+  }) async {
+    if (id != null) {
+      final rowId = int.parse(id);
+      await (_db.update(_db.localSieveScripts)
+            ..where(
+              (t) => t.id.equals(rowId) & t.accountId.equals(accountId),
+            ))
+          .write(
+        LocalSieveScriptsCompanion(
+          name: Value(name),
+          content: Value(content),
+        ),
+      );
+      final updated = await (_db.select(_db.localSieveScripts)
+            ..where(
+              (t) => t.id.equals(rowId) & t.accountId.equals(accountId),
+            ))
+          .getSingleOrNull();
+      return SieveScript(
+        id: id,
+        name: name,
+        blobId: id,
+        isActive: updated?.isActive ?? false,
+      );
+    }
+    final rowId = await _db.into(_db.localSieveScripts).insert(
+          LocalSieveScriptsCompanion.insert(
+            accountId: accountId,
+            name: name,
+            content: Value(content),
+          ),
+        );
+    final idStr = rowId.toString();
+    return SieveScript(id: idStr, name: name, blobId: idStr, isActive: false);
+  }
+
+  Future<void> deleteScript(String accountId, String scriptId) async {
+    final rowId = int.parse(scriptId);
+    await (_db.delete(_db.localSieveScripts)
+          ..where(
+            (t) => t.id.equals(rowId) & t.accountId.equals(accountId),
+          ))
+        .go();
+  }
+
+  Future<void> activateScript(String accountId, String scriptId) async {
+    await _db.transaction(() async {
+      await (_db.update(_db.localSieveScripts)
+            ..where((t) => t.accountId.equals(accountId)))
+          .write(const LocalSieveScriptsCompanion(isActive: Value(false)));
+      final rowId = int.parse(scriptId);
+      await (_db.update(_db.localSieveScripts)
+            ..where(
+              (t) => t.id.equals(rowId) & t.accountId.equals(accountId),
+            ))
+          .write(const LocalSieveScriptsCompanion(isActive: Value(true)));
+    });
+  }
+}

lib/data/imap/tls_error.dart

@@ -21,15 +21,52 @@ class TlsModeMismatchException implements Exception {
       'STARTTLS). Original error: $original';
 }
 
-/// If [error] is a TLS handshake failure caused by a wrong-version-number
-/// (i.e. the server is not speaking TLS), throw a [TlsModeMismatchException]
-/// with [host]/[port] context. Otherwise rethrow [error] unchanged.
+/// Wraps a TLS certificate verification failure into a user-actionable message.
+///
+/// Thrown when the server's certificate cannot be verified — either because it
+/// is self-signed, expired, or the CA chain has changed since the account was
+/// set up.
+class TlsCertificateException implements Exception {
+  TlsCertificateException(this.host, this.port, this.original);
+  final String host;
+  final int port;
+  final Object original;
+
+  @override
+  String toString() =>
+      'TLS certificate error on $host:$port — the server certificate could '
+      'not be verified. The certificate may have changed or expired. '
+      'Please re-check your account settings or contact your mail provider. '
+      'Original error: $original';
+}
+
+/// Returns true if [error] is a permanent TLS configuration error that will
+/// not resolve on its own and requires user action.
+bool isTlsConfigError(Object error) =>
+    error is TlsModeMismatchException || error is TlsCertificateException;
+
+/// If [error] is a recognisable TLS handshake failure, wraps it in a typed
+/// exception and throws it.  Otherwise rethrows [error] unchanged.
+///
+/// Recognised patterns:
+/// - `WRONG_VERSION_NUMBER` → [TlsModeMismatchException] (port/mode mismatch)
+/// - `CERTIFICATE_VERIFY_FAILED` / `HandshakeException` → [TlsCertificateException]
 Never rethrowAsTlsHint(Object error, StackTrace stack, String host, int port) {
-  if (error.toString().contains('WRONG_VERSION_NUMBER')) {
+  final s = error.toString();
+  if (s.contains('WRONG_VERSION_NUMBER')) {
     Error.throwWithStackTrace(
       TlsModeMismatchException(host, port, error),
       stack,
     );
   }
+  if (s.contains('CERTIFICATE_VERIFY_FAILED') ||
+      s.contains('HandshakeException') ||
+      s.contains('CERTIFICATE_EXPIRED') ||
+      s.contains('CERTIFICATE_UNKNOWN')) {
+    Error.throwWithStackTrace(
+      TlsCertificateException(host, port, error),
+      stack,
+    );
+  }
   Error.throwWithStackTrace(error, stack);
 }

lib/data/repositories/email_repository_impl.dart

@@ -13,6 +13,10 @@ import 'package:sharedinbox/core/models/account.dart' as account_model;
 import 'package:sharedinbox/core/models/email.dart' as model;
 import 'package:sharedinbox/core/repositories/account_repository.dart';
 import 'package:sharedinbox/core/repositories/email_repository.dart';
+import 'package:sharedinbox/core/sieve/sieve_interpreter.dart';
+import 'package:sharedinbox/core/sieve/sieve_parser.dart';
+import 'package:sharedinbox/core/sieve/sieve_rule.dart';
+import 'package:sharedinbox/core/utils/cid_utils.dart';
 import 'package:sharedinbox/core/utils/logger.dart';
 import 'package:sharedinbox/data/db/database.dart';
 import 'package:sharedinbox/data/imap/imap_client_factory.dart';
@@ -58,15 +62,17 @@ class EmailRepositoryImpl implements EmailRepository {
   @override
   Stream<List<model.Email>> observeEmails(
     String accountId,
-    String mailboxPath,
-  ) {
+    String mailboxPath, {
+    int limit = 50,
+  }) {
     return (_db.select(_db.emails)
           ..where(
             (t) =>
                 t.accountId.equals(accountId) &
                 t.mailboxPath.equals(mailboxPath),
           )
-          ..orderBy([(t) => OrderingTerm.desc(t.receivedAt)]))
+          ..orderBy([(t) => OrderingTerm.desc(t.receivedAt)])
+          ..limit(limit))
         .watch()
         .map((rows) => rows.map(_toModel).toList());
   }
@@ -74,15 +80,17 @@ class EmailRepositoryImpl implements EmailRepository {
   @override
   Stream<List<model.EmailThread>> observeThreads(
     String accountId,
-    String mailboxPath,
-  ) {
+    String mailboxPath, {
+    int limit = 50,
+  }) {
     return (_db.select(_db.threads)
           ..where(
             (t) =>
                 t.accountId.equals(accountId) &
                 t.mailboxPath.equals(mailboxPath),
           )
-          ..orderBy([(t) => OrderingTerm.desc(t.latestDate)]))
+          ..orderBy([(t) => OrderingTerm.desc(t.latestDate)])
+          ..limit(limit))
         .watch()
         .map((rows) => rows.map(_threadRowToModel).toList());
   }
@@ -231,7 +239,9 @@ class EmailRepositoryImpl implements EmailRepository {
       final fetch = await client.uidFetchMessage(emailRow.uid, '(BODY.PEEK[])');
       final msg = fetch.messages.first;
       final textBody = msg.decodeTextPlainPart();
-      final htmlBody = msg.decodeTextHtmlPart();
+      final rawHtml = msg.decodeTextHtmlPart();
+      final htmlBody =
+          rawHtml == null ? null : injectInlineImages(rawHtml, msg);
       final contentInfos = msg.findContentInfo();
 
       final attachmentsJson = jsonEncode(
@@ -255,6 +265,8 @@ class EmailRepositoryImpl implements EmailRepository {
             .toList(),
       );
 
+      final mimeTreeJson = _buildMimeTreeJson(msg);
+
       await _db.into(_db.emailBodies).insertOnConflictUpdate(
             EmailBodiesCompanion.insert(
               emailId: emailId,
@@ -262,6 +274,7 @@ class EmailRepositoryImpl implements EmailRepository {
               htmlBody: Value(htmlBody),
               attachmentsJson: Value(attachmentsJson),
               headersJson: Value(headersJson),
+              mimeTreeJson: Value(mimeTreeJson),
               cachedAt: Value(DateTime.now()),
             ),
           );
@@ -271,6 +284,7 @@ class EmailRepositoryImpl implements EmailRepository {
         htmlBody: htmlBody,
         attachments: _parseAttachments(attachmentsJson),
         headers: _parseHeaders(headersJson),
+        mimeTree: _parseMimeTree(mimeTreeJson),
       );
     } finally {
       await client.logout();
@@ -307,9 +321,17 @@ class EmailRepositoryImpl implements EmailRepository {
             'htmlBody',
             'bodyValues',
             'attachments',
+            'bodyStructure',
           ],
           'fetchHTMLBodyValues': true,
           'fetchTextBodyValues': true,
+          'bodyProperties': [
+            'partId',
+            'type',
+            'name',
+            'size',
+            'subParts',
+          ],
         },
         '0',
       ],
@@ -329,6 +351,12 @@ class EmailRepositoryImpl implements EmailRepository {
       }).toList(),
     );
 
+    final rawBodyStructure =
+        emailData['bodyStructure'] as Map<String, dynamic>?;
+    final mimeTreeJson = rawBodyStructure != null
+        ? jsonEncode(_jmapBodyStructureToJson(rawBodyStructure))
+        : null;
+
     await _db.into(_db.emailBodies).insertOnConflictUpdate(
           EmailBodiesCompanion.insert(
             emailId: emailId,
@@ -336,6 +364,7 @@ class EmailRepositoryImpl implements EmailRepository {
             htmlBody: Value(htmlBody),
             attachmentsJson: Value(attachmentsJson),
             headersJson: Value(headersJson),
+            mimeTreeJson: Value(mimeTreeJson),
             cachedAt: Value(DateTime.now()),
           ),
         );
@@ -346,6 +375,7 @@ class EmailRepositoryImpl implements EmailRepository {
       htmlBody: htmlBody,
       attachments: _parseAttachments(attachmentsJson),
       headers: _parseHeaders(headersJson),
+      mimeTree: _parseMimeTree(mimeTreeJson),
     );
   }
 
@@ -1444,7 +1474,8 @@ class EmailRepositoryImpl implements EmailRepository {
     final row = await (_db.select(
       _db.emails,
     )..where((t) => t.id.equals(emailId)))
-        .getSingle();
+        .getSingleOrNull();
+    if (row == null) return;
     final account = (await _accounts.getAccount(row.accountId))!;
 
     if (account.type == account_model.AccountType.jmap) {
@@ -1516,12 +1547,70 @@ class EmailRepositoryImpl implements EmailRepository {
     );
   }
 
+  @override
+  Future<void> markAllAsRead(String accountId, String mailboxPath) async {
+    final account = (await _accounts.getAccount(accountId))!;
+    final unread = await (_db.select(_db.emails)
+          ..where(
+            (t) =>
+                t.accountId.equals(accountId) &
+                t.mailboxPath.equals(mailboxPath) &
+                t.isSeen.equals(false),
+          ))
+        .get();
+    if (unread.isEmpty) return;
+
+    await _db.transaction(() async {
+      for (final row in unread) {
+        if (account.type == account_model.AccountType.jmap) {
+          await _enqueueChange(
+            accountId,
+            row.id,
+            'flag_seen',
+            jsonEncode({'seen': true}),
+          );
+        } else {
+          await _enqueueChange(
+            accountId,
+            row.id,
+            'flag_seen',
+            jsonEncode({
+              'uid': row.uid,
+              'mailboxPath': row.mailboxPath,
+              'seen': true,
+            }),
+          );
+        }
+      }
+
+      // Bulk mark all unread emails in this mailbox as seen.
+      await (_db.update(_db.emails)
+            ..where(
+              (t) =>
+                  t.accountId.equals(accountId) &
+                  t.mailboxPath.equals(mailboxPath) &
+                  t.isSeen.equals(false),
+            ))
+          .write(const EmailsCompanion(isSeen: Value(true)));
+
+      // Update all threads in this mailbox to reflect no unread.
+      await (_db.update(_db.threads)
+            ..where(
+              (t) =>
+                  t.accountId.equals(accountId) &
+                  t.mailboxPath.equals(mailboxPath),
+            ))
+          .write(const ThreadsCompanion(hasUnread: Value(false)));
+    });
+  }
+
   @override
   Future<void> moveEmail(String emailId, String destMailboxPath) async {
     final row = await (_db.select(
       _db.emails,
     )..where((t) => t.id.equals(emailId)))
-        .getSingle();
+        .getSingleOrNull();
+    if (row == null) return;
     final account = (await _accounts.getAccount(row.accountId))!;
 
     if (row.mailboxPath == destMailboxPath) {
@@ -1589,7 +1678,8 @@ class EmailRepositoryImpl implements EmailRepository {
     final row = await (_db.select(
       _db.emails,
     )..where((t) => t.id.equals(emailId)))
-        .getSingle();
+        .getSingleOrNull();
+    if (row == null) return null;
     final account = (await _accounts.getAccount(row.accountId))!;
 
     // Move to Trash when possible so the user can recover the message.
@@ -1783,6 +1873,22 @@ class EmailRepositoryImpl implements EmailRepository {
     return expired.length;
   }
 
+  @override
+  @override
+  Future<model.Email?> findEmailByMessageId(
+    String accountId,
+    String messageId,
+  ) async {
+    final row = await (_db.select(_db.emails)
+          ..where(
+            (t) =>
+                t.accountId.equals(accountId) & t.messageId.equals(messageId),
+          )
+          ..limit(1))
+        .getSingleOrNull();
+    return row == null ? null : _toModel(row);
+  }
+
   @override
   Future<void> restoreEmails(List<model.Email> emails) async {
     for (final e in emails) {
@@ -1814,6 +1920,218 @@ class EmailRepositoryImpl implements EmailRepository {
     }
   }
 
+  /// Applies locally stored active Sieve rules to INBOX emails that have not
+  /// been processed yet. See [EmailRepository.applySieveRules] for details.
+  @override
+  Future<int> applySieveRules(String accountId) async {
+    final scriptRow = await (_db.select(_db.localSieveScripts)
+          ..where(
+            (t) => t.accountId.equals(accountId) & t.isActive.equals(true),
+          )
+          ..limit(1))
+        .getSingleOrNull();
+    if (scriptRow == null) return 0;
+
+    List<SieveRule> rules;
+    try {
+      rules = SieveParser().parse(scriptRow.content);
+    } catch (e) {
+      log('Sieve parse error for account $accountId: $e');
+      return 0;
+    }
+    if (rules.isEmpty) return 0;
+
+    final inboxMailbox = await (_db.select(_db.mailboxes)
+          ..where(
+            (t) => t.accountId.equals(accountId) & t.role.equals('inbox'),
+          )
+          ..limit(1))
+        .getSingleOrNull();
+    final inboxPath = inboxMailbox?.path ?? 'INBOX';
+
+    final alreadyApplied = await (_db.select(_db.localSieveApplied)
+          ..where((t) => t.accountId.equals(accountId)))
+        .get();
+    final appliedIds = alreadyApplied.map((r) => r.messageId).toSet();
+
+    final inboxEmails = await (_db.select(_db.emails)
+          ..where(
+            (t) =>
+                t.accountId.equals(accountId) &
+                t.mailboxPath.equals(inboxPath) &
+                t.messageId.isNotNull(),
+          ))
+        .get();
+
+    final account = (await _accounts.getAccount(accountId))!;
+    final interpreter = SieveInterpreter();
+    var matched = 0;
+
+    for (final row in inboxEmails) {
+      final msgId = row.messageId!;
+      if (appliedIds.contains(msgId)) continue;
+
+      final emailCtx = _buildSieveContext(row);
+
+      SieveExecutionContext result;
+      try {
+        result = interpreter.execute(rules, emailCtx);
+      } catch (e) {
+        log('Sieve interpreter error for message $msgId: $e');
+        await _markSieveApplied(accountId, msgId);
+        continue;
+      }
+
+      await _markSieveApplied(accountId, msgId);
+
+      if (result.isCancelled) {
+        await _enqueueSieveDelete(account, row);
+        matched++;
+      } else if (result.targetFolders.isNotEmpty) {
+        final dest = result.targetFolders.first;
+        await _enqueueSieveMove(account, row, dest);
+        matched++;
+      } else if (result.flagsToAdd.isNotEmpty) {
+        await _enqueueSieveFlagSeen(account, row);
+        matched++;
+      }
+    }
+    return matched;
+  }
+
+  SieveEmailContext _buildSieveContext(Email row) {
+    String formatAddrs(String json) {
+      try {
+        final list = jsonDecode(json) as List<dynamic>;
+        return list.map((e) {
+          final m = e as Map<String, dynamic>;
+          final name = m['name'] as String? ?? '';
+          final email = m['email'] as String? ?? '';
+          return name.isEmpty ? email : '$name <$email>';
+        }).join(', ');
+      } catch (_) {
+        return '';
+      }
+    }
+
+    return SieveEmailContext(
+      headers: {
+        if (row.subject != null && row.subject!.isNotEmpty)
+          'subject': [row.subject!],
+        'from': [formatAddrs(row.fromJson)],
+        'to': [formatAddrs(row.toAddresses)],
+        'cc': [formatAddrs(row.ccJson)],
+        if (row.messageId != null) 'message-id': [row.messageId!],
+      },
+    );
+  }
+
+  Future<void> _markSieveApplied(String accountId, String messageId) async {
+    await _db.into(_db.localSieveApplied).insertOnConflictUpdate(
+          LocalSieveAppliedCompanion.insert(
+            accountId: accountId,
+            messageId: messageId,
+            appliedAt: DateTime.now(),
+          ),
+        );
+  }
+
+  Future<void> _enqueueSieveMove(
+    account_model.Account account,
+    Email row,
+    String folder,
+  ) async {
+    String destPath;
+    if (account.type == account_model.AccountType.jmap) {
+      final destMailbox = await (_db.select(_db.mailboxes)
+            ..where(
+              (t) => t.accountId.equals(account.id) & t.name.equals(folder),
+            )
+            ..limit(1))
+          .getSingleOrNull();
+      if (destMailbox == null) {
+        log('Sieve: JMAP mailbox "$folder" not found for account ${account.id}');
+        return;
+      }
+      destPath = destMailbox.path;
+      await _enqueueChange(
+        account.id,
+        row.id,
+        'move',
+        jsonEncode({'src': row.mailboxPath, 'dest': destPath}),
+      );
+    } else {
+      destPath = folder;
+      await _enqueueChange(
+        account.id,
+        row.id,
+        'move',
+        jsonEncode({
+          'uid': row.uid,
+          'mailboxPath': row.mailboxPath,
+          'dest': destPath,
+        }),
+      );
+    }
+    await (_db.update(_db.emails)..where((t) => t.id.equals(row.id))).write(
+      EmailsCompanion(mailboxPath: Value(destPath)),
+    );
+    await _updateThread(account.id, row.mailboxPath, row.threadId ?? row.id);
+    await _updateThread(account.id, destPath, row.threadId ?? row.id);
+  }
+
+  Future<void> _enqueueSieveDelete(
+    account_model.Account account,
+    Email row,
+  ) async {
+    if (account.type == account_model.AccountType.jmap) {
+      await _enqueueChange(
+        account.id,
+        row.id,
+        'delete',
+        jsonEncode(<String, dynamic>{}),
+      );
+    } else {
+      await _enqueueChange(
+        account.id,
+        row.id,
+        'delete',
+        jsonEncode({'uid': row.uid, 'mailboxPath': row.mailboxPath}),
+      );
+    }
+    await (_db.delete(_db.emails)..where((t) => t.id.equals(row.id))).go();
+    await _updateThread(account.id, row.mailboxPath, row.threadId ?? row.id);
+  }
+
+  Future<void> _enqueueSieveFlagSeen(
+    account_model.Account account,
+    Email row,
+  ) async {
+    if (account.type == account_model.AccountType.jmap) {
+      await _enqueueChange(
+        account.id,
+        row.id,
+        'flag_seen',
+        jsonEncode({'seen': true}),
+      );
+    } else {
+      await _enqueueChange(
+        account.id,
+        row.id,
+        'flag_seen',
+        jsonEncode({
+          'uid': row.uid,
+          'mailboxPath': row.mailboxPath,
+          'seen': true,
+        }),
+      );
+    }
+    await (_db.update(_db.emails)..where((t) => t.id.equals(row.id))).write(
+      const EmailsCompanion(isSeen: Value(true)),
+    );
+    await _updateThread(account.id, row.mailboxPath, row.threadId ?? row.id);
+  }
+
   /// Drains pending changes for [accountId] via the appropriate protocol.
   /// Called at the start of each sync cycle. Returns count of applied changes.
   @override
@@ -1929,7 +2247,18 @@ class EmailRepositoryImpl implements EmailRepository {
               .go();
           applied++;
         } catch (e) {
-          await _recordChangeError(row, e);
+          if (_isImapNotFoundError(e)) {
+            // Email already gone on the server — treat as success so the
+            // pending change doesn't accumulate or block future changes.
+            await (_db.delete(
+              _db.pendingChanges,
+            )..where((t) => t.id.equals(row.id)))
+                .go();
+            applied++;
+            log('IMAP change ${row.id} skipped: message already gone ($e)');
+          } else {
+            await _recordChangeError(row, e);
+          }
         }
       }
     } finally {
@@ -1938,13 +2267,19 @@ class EmailRepositoryImpl implements EmailRepository {
     return applied;
   }
 
+  bool _isImapNotFoundError(Object e) {
+    final s = e.toString().toLowerCase();
+    return s.contains('nonexistent') || s.contains('not found');
+  }
+
   Future<void> _applyPendingChangeImap(
     imap.ImapClient client,
     PendingChangeRow row,
   ) async {
     final payload = jsonDecode(row.payload) as Map<String, dynamic>;
     final uid = payload['uid'] as int;
-    final mailboxPath = payload['mailboxPath'] as String;
+    // snooze/unsnooze payloads use 'src' for the source folder; all others use 'mailboxPath'.
+    final mailboxPath = (payload['mailboxPath'] ?? payload['src']) as String;
     final seq = imap.MessageSequence.fromId(uid, isUid: true);
     await client.selectMailboxByPath(mailboxPath);
 
@@ -2083,8 +2418,29 @@ class EmailRepositoryImpl implements EmailRepository {
         final until = payload['until'] as String;
         final timestamp = until.replaceAll(':', '').replaceAll('-', '');
         final keyword = 'snz:$timestamp';
-        final destMailboxId = payload['dest'] as String;
+        var destMailboxId = payload['dest'] as String;
         final srcMailboxId = payload['src'] as String;
+        // When the Snoozed folder didn't exist at enqueue time, 'dest' holds
+        // the literal name 'Snoozed' rather than a JMAP mailbox ID.  Create it.
+        if (destMailboxId == 'Snoozed') {
+          final createResps = await jmap.call([
+            [
+              'Mailbox/set',
+              {
+                'accountId': jmap.accountId,
+                'create': {
+                  'new-snoozed': {'name': 'Snoozed', 'role': 'snoozed'},
+                },
+              },
+              '0',
+            ],
+          ]);
+          final createResult = _responseArgs(createResps, 0, 'Mailbox/set');
+          final created = createResult['created'] as Map<String, dynamic>?;
+          final newId = (created?['new-snoozed']
+              as Map<String, dynamic>?)?['id'] as String?;
+          if (newId != null) destMailboxId = newId;
+        }
         responses = await jmap.call([
           [
             'Email/set',
@@ -2448,9 +2804,13 @@ class EmailRepositoryImpl implements EmailRepository {
     );
     try {
       await client.selectMailboxByPath(emailRow.mailboxPath);
+      // Fetch the full message so enough_mail has MIME headers (including
+      // Content-Transfer-Encoding) and getPart() can decode the part correctly.
+      // A partial BODY.PEEK[n] fetch omits those headers, causing
+      // decodeContentBinary() to return raw base64 instead of decoded bytes.
       final fetch = await client.uidFetchMessage(
         emailRow.uid,
-        'BODY.PEEK[${attachment.fetchPartId}]',
+        'BODY.PEEK[]',
       );
       final msg = fetch.messages.first;
       final part = msg.getPart(attachment.fetchPartId) ?? msg;
@@ -2465,33 +2825,103 @@ class EmailRepositoryImpl implements EmailRepository {
     }
   }
 
+  @override
+  Future<String> fetchRawRfc822(String emailId) async {
+    final emailRow = await (_db.select(
+      _db.emails,
+    )..where((t) => t.id.equals(emailId)))
+        .getSingle();
+    final account = (await _accounts.getAccount(emailRow.accountId))!;
+    final password = await _accounts.getPassword(account.id);
+
+    if (account.type == account_model.AccountType.jmap) {
+      final jmap = await JmapClient.connect(
+        httpClient: _httpClient,
+        jmapUrl: Uri.parse(account.jmapUrl!),
+        username: _effectiveUsername(account),
+        password: password,
+      );
+      final jmapEmailId = emailId.contains(':')
+          ? emailId.substring(emailId.indexOf(':') + 1)
+          : emailId;
+      final responses = await jmap.call([
+        [
+          'Email/get',
+          {
+            'accountId': jmap.accountId,
+            'ids': [jmapEmailId],
+            'properties': ['id', 'blobId'],
+          },
+          '0',
+        ],
+      ]);
+      final result = _responseArgs(responses, 0, 'Email/get');
+      final emailData =
+          (result['list'] as List<dynamic>).first as Map<String, dynamic>;
+      final blobId = emailData['blobId'] as String;
+      final bytes = await jmap.downloadBlob(
+        blobId,
+        name: 'email.eml',
+        type: 'message/rfc822',
+      );
+      return utf8.decode(bytes, allowMalformed: true);
+    }
+
+    final client = await _imapConnect(
+      account,
+      _effectiveUsername(account),
+      password,
+    );
+    try {
+      await client.selectMailboxByPath(emailRow.mailboxPath);
+      final fetch = await client.uidFetchMessage(
+        emailRow.uid,
+        'BODY.PEEK[]',
+      );
+      return fetch.messages.first.renderMessage();
+    } finally {
+      await client.logout();
+    }
+  }
+
   @override
   Future<List<model.Email>> searchEmailsGlobal(
     String? accountId,
     String query,
   ) async {
+    final ftsQuery = _toFtsQuery(query);
+    if (ftsQuery.isEmpty) return [];
+
+    final sql = accountId != null
+        ? 'SELECT e.* FROM email_fts f JOIN emails e ON e.rowid = f.rowid'
+            ' WHERE email_fts MATCH ? AND e.account_id = ? ORDER BY rank LIMIT 50'
+        : 'SELECT e.* FROM email_fts f JOIN emails e ON e.rowid = f.rowid'
+            ' WHERE email_fts MATCH ? ORDER BY rank LIMIT 50';
+    final variables = accountId != null
+        ? [Variable<String>(ftsQuery), Variable<String>(accountId)]
+        : [Variable<String>(ftsQuery)];
+
+    final queryRows = await _db
+        .customSelect(sql, variables: variables, readsFrom: {_db.emails}).get();
+    final emailRows = await Future.wait(
+      queryRows.map((r) => _db.emails.mapFromRow(r)),
+    );
+    return emailRows.map(_toModel).toList();
+  }
+
+  /// Converts a user query string into an FTS5 match expression.
+  /// Each whitespace-separated word becomes a prefix term (word*) so that
+  /// partial words still match. Special FTS5 characters are stripped.
+  static String _toFtsQuery(String query) {
     final words = query
-        .toLowerCase()
+        .trim()
         .split(RegExp(r'\s+'))
         .where((w) => w.isNotEmpty)
+        .map((w) => w.replaceAll(RegExp(r'[^\w]'), ''))
+        .where((w) => w.isNotEmpty)
         .toList();
-    final rows = await (_db.select(_db.emails)
-          ..where((t) {
-            Expression<bool> condition = const Constant(true);
-            if (accountId != null) {
-              condition = t.accountId.equals(accountId);
-            }
-            for (final word in words) {
-              final pattern = '%$word%';
-              condition = condition &
-                  (t.subject.like(pattern) | t.preview.like(pattern));
-            }
-            return condition;
-          })
-          ..orderBy([(t) => OrderingTerm.desc(t.receivedAt)])
-          ..limit(50))
-        .get();
-    return rows.map(_toModel).toList();
+    if (words.isEmpty) return '';
+    return words.map((w) => '$w*').join(' ');
   }
 
   @override
@@ -2517,6 +2947,52 @@ class EmailRepositoryImpl implements EmailRepository {
     return rows.map(_toModel).toList();
   }
 
+  @override
+  Future<List<model.EmailAddress>> searchAddresses(
+    String? accountId,
+    String query, {
+    int limit = 10,
+  }) async {
+    if (query.length < 2) return [];
+    final pattern = '%${query.toLowerCase()}%';
+    final rows = await (_db.select(_db.emails)
+          ..where((t) {
+            Expression<bool> cond = const Constant(true);
+            if (accountId != null) cond = t.accountId.equals(accountId);
+            cond = cond &
+                (t.fromJson.like(pattern) |
+                    t.toAddresses.like(pattern) |
+                    t.ccJson.like(pattern));
+            return cond;
+          })
+          ..orderBy([(t) => OrderingTerm.desc(t.receivedAt)])
+          ..limit(100))
+        .get();
+
+    final seen = <String>{};
+    final results = <model.EmailAddress>[];
+    final lowerQuery = query.toLowerCase();
+    for (final row in rows) {
+      for (final jsonStr in [row.fromJson, row.toAddresses, row.ccJson]) {
+        final list = jsonDecode(jsonStr) as List<dynamic>;
+        for (final e in list) {
+          final map = e as Map<String, dynamic>;
+          final addr = model.EmailAddress(
+            name: map['name'] as String?,
+            email: map['email'] as String,
+          );
+          if ((addr.email.toLowerCase().contains(lowerQuery) ||
+                  (addr.name?.toLowerCase().contains(lowerQuery) ?? false)) &&
+              seen.add(addr.email.toLowerCase())) {
+            results.add(addr);
+            if (results.length >= limit) return results;
+          }
+        }
+      }
+    }
+    return results;
+  }
+
   @override
   Future<List<model.Email>> searchEmails(
     String accountId,
@@ -2679,6 +3155,27 @@ class EmailRepositoryImpl implements EmailRepository {
         htmlBody: row.htmlBody,
         attachments: _parseAttachments(row.attachmentsJson),
         headers: _parseHeaders(row.headersJson),
+        mimeTree: _parseMimeTree(row.mimeTreeJson),
+      );
+
+  model.MimePart? _parseMimeTree(String? jsonStr) {
+    if (jsonStr == null || jsonStr.isEmpty) return null;
+    try {
+      return _mimePartFromJson(jsonDecode(jsonStr) as Map<String, dynamic>);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  model.MimePart _mimePartFromJson(Map<String, dynamic> m) => model.MimePart(
+        contentType: m['contentType'] as String? ?? 'application/octet-stream',
+        filename: m['filename'] as String?,
+        size: m['size'] as int?,
+        encoding: m['encoding'] as String?,
+        children: ((m['children'] as List<dynamic>?) ?? [])
+            .cast<Map<String, dynamic>>()
+            .map(_mimePartFromJson)
+            .toList(),
       );
 
   List<model.EmailHeader> _parseHeaders(String? jsonStr) {
@@ -2770,3 +3267,36 @@ class EmailRepositoryImpl implements EmailRepository {
     }
   }
 }
+
+/// Recursively converts an [imap.MimePart] into a JSON-serialisable map.
+Map<String, dynamic> _mimePartToJson(imap.MimePart part) {
+  final ct = part.getHeaderContentType();
+  final disposition = part.getHeaderContentDisposition();
+  final rawEncoding =
+      part.getHeader('content-transfer-encoding')?.firstOrNull?.value;
+  final encoding = rawEncoding?.split(';').first.trim().toLowerCase();
+  return {
+    'contentType': ct?.mediaType.text ?? 'application/octet-stream',
+    'filename': disposition?.filename ?? ct?.parameters['name'],
+    'size': disposition?.size,
+    'encoding': encoding,
+    'children': (part.parts ?? []).map(_mimePartToJson).toList(),
+  };
+}
+
+/// Builds a JSON string representing the MIME tree of [msg].
+String _buildMimeTreeJson(imap.MimeMessage msg) =>
+    jsonEncode(_mimePartToJson(msg));
+
+/// Converts a JMAP `bodyStructure` object into the same JSON format used by
+/// [_mimePartToJson], so [_parseMimeTree] can deserialise it uniformly.
+Map<String, dynamic> _jmapBodyStructureToJson(Map<String, dynamic> m) => {
+      'contentType': m['type'] as String? ?? 'application/octet-stream',
+      'filename': m['name'],
+      'size': m['size'],
+      'encoding': null,
+      'children': ((m['subParts'] as List<dynamic>?) ?? [])
+          .cast<Map<String, dynamic>>()
+          .map(_jmapBodyStructureToJson)
+          .toList(),
+    };

lib/data/repositories/search_history_repository_impl.dart

@@ -0,0 +1,57 @@
+import 'package:drift/drift.dart';
+import 'package:sharedinbox/core/repositories/search_history_repository.dart';
+import 'package:sharedinbox/data/db/database.dart';
+
+class SearchHistoryRepositoryImpl implements SearchHistoryRepository {
+  SearchHistoryRepositoryImpl(this._db);
+  final AppDatabase _db;
+
+  static const _maxEntries = 10;
+
+  @override
+  Future<List<String>> getRecentSearches() async {
+    final rows = await (_db.select(_db.searchHistoryEntries)
+          ..orderBy([(t) => OrderingTerm.desc(t.searchedAt)])
+          ..limit(_maxEntries))
+        .get();
+    return rows.map((r) => r.query).toList();
+  }
+
+  @override
+  Future<void> saveSearch(String query) async {
+    final trimmed = query.trim();
+    if (trimmed.isEmpty) return;
+
+    await _db.transaction(() async {
+      // Remove existing entry for same query (deduplication).
+      await (_db.delete(_db.searchHistoryEntries)
+            ..where((t) => t.query.equals(trimmed)))
+          .go();
+
+      await _db.into(_db.searchHistoryEntries).insert(
+            SearchHistoryEntriesCompanion.insert(
+              query: trimmed,
+              searchedAt: DateTime.now(),
+            ),
+          );
+
+      // Prune to the most recent _maxEntries.
+      final keepIds = await (_db.select(_db.searchHistoryEntries)
+            ..orderBy([(t) => OrderingTerm.desc(t.searchedAt)])
+            ..limit(_maxEntries))
+          .map((r) => r.id)
+          .get();
+
+      if (keepIds.isNotEmpty) {
+        await (_db.delete(_db.searchHistoryEntries)
+              ..where((t) => t.id.isNotIn(keepIds)))
+            .go();
+      }
+    });
+  }
+
+  @override
+  Future<void> clearHistory() async {
+    await _db.delete(_db.searchHistoryEntries).go();
+  }
+}

lib/data/repositories/share_key_repository_impl.dart

@@ -0,0 +1,67 @@
+import 'dart:convert';
+
+import 'package:drift/drift.dart';
+
+import 'package:sharedinbox/core/repositories/share_key_repository.dart';
+import 'package:sharedinbox/core/services/share_encryption_service.dart';
+import 'package:sharedinbox/data/db/database.dart';
+
+/// Drift-backed implementation of [ShareKeyRepository].
+///
+/// Each key pair lives for 20 minutes.  Expired rows are pruned whenever a
+/// new key pair is created or looked up.
+class ShareKeyRepositoryImpl implements ShareKeyRepository {
+  ShareKeyRepositoryImpl(this._db);
+
+  final AppDatabase _db;
+
+  @override
+  Future<ShareKeyMaterial> createKeyPair() async {
+    await _pruneExpired();
+
+    final material = await ShareEncryptionService.generateKeyPair();
+    final keyIdHex = _hex(material.keyId);
+    final expiresAt = DateTime.now().toUtc().add(const Duration(minutes: 20));
+
+    await _db.into(_db.shareKeys).insert(
+          ShareKeysCompanion.insert(
+            id: keyIdHex,
+            publicKey: base64.encode(material.publicKeyBytes),
+            privateKey: base64.encode(material.privateKeyBytes),
+            expiresAt: expiresAt,
+          ),
+        );
+
+    return material;
+  }
+
+  @override
+  Future<ShareKeyMaterial?> findByKeyId(Uint8List keyId) async {
+    await _pruneExpired();
+
+    final keyIdHex = _hex(keyId);
+    final row = await (_db.select(_db.shareKeys)
+          ..where((t) => t.id.equals(keyIdHex)))
+        .getSingleOrNull();
+
+    if (row == null) return null;
+    if (row.expiresAt.isBefore(DateTime.now().toUtc())) return null;
+
+    return ShareKeyMaterial(
+      keyId: keyId,
+      publicKeyBytes: Uint8List.fromList(base64.decode(row.publicKey)),
+      privateKeyBytes: Uint8List.fromList(base64.decode(row.privateKey)),
+    );
+  }
+
+  Future<void> _pruneExpired() async {
+    await (_db.delete(_db.shareKeys)
+          ..where(
+            (t) => t.expiresAt.isSmallerThanValue(DateTime.now().toUtc()),
+          ))
+        .go();
+  }
+
+  static String _hex(Uint8List bytes) =>
+      bytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
+}

lib/data/repositories/sync_log_repository_impl.dart

@@ -49,6 +49,7 @@ class SyncLogRepositoryImpl implements SyncLogRepository {
                 fetched: Value(s.fetched),
                 skipped: Value(s.skipped),
                 bytesTransferred: Value(s.bytesTransferred),
+                durationMs: Value(s.duration?.inMilliseconds),
               ),
             );
       }
@@ -90,6 +91,9 @@ class SyncLogRepositoryImpl implements SyncLogRepository {
                     fetched: m.fetched,
                     skipped: m.skipped,
                     bytesTransferred: m.bytesTransferred,
+                    duration: m.durationMs != null
+                        ? Duration(milliseconds: m.durationMs!)
+                        : null,
                   ),
                 )
                 .toList(),

lib/di.dart

@@ -3,11 +3,14 @@ import 'dart:async';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:http/http.dart' as http;
 import 'package:sharedinbox/core/models/account.dart' as model;
+import 'package:sharedinbox/core/models/email.dart';
 import 'package:sharedinbox/core/models/undo_action.dart';
 import 'package:sharedinbox/core/repositories/account_repository.dart';
 import 'package:sharedinbox/core/repositories/draft_repository.dart';
 import 'package:sharedinbox/core/repositories/email_repository.dart';
 import 'package:sharedinbox/core/repositories/mailbox_repository.dart';
+import 'package:sharedinbox/core/repositories/search_history_repository.dart';
+import 'package:sharedinbox/core/repositories/share_key_repository.dart';
 import 'package:sharedinbox/core/repositories/undo_repository.dart';
 import 'package:sharedinbox/core/services/account_discovery_service.dart';
 import 'package:sharedinbox/core/services/connection_test_service.dart';
@@ -17,13 +20,16 @@ import 'package:sharedinbox/core/services/undo_service.dart';
 import 'package:sharedinbox/core/storage/secure_storage.dart';
 import 'package:sharedinbox/core/sync/account_sync_manager.dart';
 import 'package:sharedinbox/core/sync/reliability_runner.dart';
-import 'package:sharedinbox/data/db/database.dart';
+import 'package:sharedinbox/data/db/database.dart' hide Email, EmailBody;
+import 'package:sharedinbox/data/db/local_sieve_repository.dart';
 import 'package:sharedinbox/data/imap/imap_client_factory.dart';
 import 'package:sharedinbox/data/jmap/sieve_repository.dart';
 import 'package:sharedinbox/data/repositories/account_repository_impl.dart';
 import 'package:sharedinbox/data/repositories/draft_repository_impl.dart';
 import 'package:sharedinbox/data/repositories/email_repository_impl.dart';
 import 'package:sharedinbox/data/repositories/mailbox_repository_impl.dart';
+import 'package:sharedinbox/data/repositories/search_history_repository_impl.dart';
+import 'package:sharedinbox/data/repositories/share_key_repository_impl.dart';
 import 'package:sharedinbox/data/repositories/sync_log_repository_impl.dart';
 import 'package:sharedinbox/data/repositories/undo_repository_impl.dart';
 import 'package:sharedinbox/data/storage/flutter_secure_storage_impl.dart';
@@ -57,6 +63,10 @@ final accountRepositoryProvider = Provider<AccountRepository>((ref) {
   );
 });
 
+final shareKeyRepositoryProvider = Provider<ShareKeyRepository>((ref) {
+  return ShareKeyRepositoryImpl(ref.watch(dbProvider));
+});
+
 final mailboxRepositoryProvider = Provider<MailboxRepository>((ref) {
   return MailboxRepositoryImpl(
     ref.watch(dbProvider),
@@ -86,6 +96,11 @@ final undoRepositoryProvider = Provider<UndoRepository>((ref) {
   return UndoRepositoryImpl(ref.watch(dbProvider));
 });
 
+final searchHistoryRepositoryProvider =
+    Provider<SearchHistoryRepository>((ref) {
+  return SearchHistoryRepositoryImpl(ref.watch(dbProvider));
+});
+
 final syncLogRepositoryProvider = Provider((ref) {
   return SyncLogRepositoryImpl(ref.watch(dbProvider));
 });
@@ -147,6 +162,10 @@ final sieveRepositoryProvider = Provider<SieveRepository>((ref) {
   );
 });
 
+final localSieveRepositoryProvider = Provider<LocalSieveRepository>((ref) {
+  return LocalSieveRepository(ref.watch(dbProvider));
+});
+
 final connectionTestServiceProvider = Provider<ConnectionTestService>((ref) {
   return ConnectionTestServiceImpl(
     ref.watch(httpClientProvider),
@@ -168,6 +187,27 @@ final undoServiceProvider =
   return service;
 });
 
+/// Loads email header + body and marks the email as seen.
+/// Owned by [EmailDetailScreen]; decouples data loading from the widget tree.
+final emailDetailProvider = AsyncNotifierProvider.autoDispose
+    .family<EmailDetailNotifier, (Email?, EmailBody), String>(
+  EmailDetailNotifier.new,
+);
+
+class EmailDetailNotifier
+    extends AutoDisposeFamilyAsyncNotifier<(Email?, EmailBody), String> {
+  @override
+  Future<(Email?, EmailBody)> build(String emailId) async {
+    final repo = ref.read(emailRepositoryProvider);
+    final results = await Future.wait([
+      repo.getEmail(emailId),
+      repo.getEmailBody(emailId),
+    ]);
+    unawaited(repo.setFlag(emailId, seen: true));
+    return (results[0] as Email?, results[1] as EmailBody);
+  }
+}
+
 final accountByIdProvider =
     StreamProvider.autoDispose.family<model.Account?, String>((ref, accountId) {
   return ref.watch(accountRepositoryProvider).observeAccounts().map(

lib/main.dart

@@ -70,7 +70,7 @@ class _SharedInboxAppState extends ConsumerState<SharedInboxApp> {
   @override
   Widget build(BuildContext context) {
     return MaterialApp.router(
-      title: 'SharedInbox',
+      title: 'sharedinbox.de',
       theme: ThemeData(
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.indigo),
         useMaterial3: true,

lib/ui/router.dart

@@ -2,7 +2,10 @@ import 'package:go_router/go_router.dart';
 
 import 'package:sharedinbox/core/models/sieve_script.dart';
 
+import 'package:sharedinbox/ui/screens/about_screen.dart';
 import 'package:sharedinbox/ui/screens/account_list_screen.dart';
+import 'package:sharedinbox/ui/screens/account_receive_screen.dart';
+import 'package:sharedinbox/ui/screens/account_send_screen.dart';
 import 'package:sharedinbox/ui/screens/add_account_screen.dart';
 import 'package:sharedinbox/ui/screens/address_emails_screen.dart';
 import 'package:sharedinbox/ui/screens/changelog_screen.dart';
@@ -33,6 +36,14 @@ final router = GoRouter(
               path: 'add',
               builder: (ctx, state) => const AddAccountScreen(),
             ),
+            GoRoute(
+              path: 'receive',
+              builder: (ctx, state) => const AccountReceiveScreen(),
+            ),
+            GoRoute(
+              path: 'send',
+              builder: (ctx, state) => const AccountSendScreen(),
+            ),
             GoRoute(
               path: 'undo-log',
               builder: (ctx, state) => const UndoLogScreen(),
@@ -41,6 +52,10 @@ final router = GoRouter(
               path: 'changelog',
               builder: (ctx, state) => const ChangeLogScreen(),
             ),
+            GoRoute(
+              path: 'about',
+              builder: (ctx, state) => const AboutScreen(),
+            ),
             GoRoute(
               path: ':accountId/edit',
               builder: (ctx, state) => EditAccountScreen(
@@ -65,6 +80,21 @@ final router = GoRouter(
                 script: state.extra as SieveScript?,
               ),
             ),
+            GoRoute(
+              path: ':accountId/sieve/local',
+              builder: (ctx, state) => SieveScriptsScreen(
+                accountId: state.pathParameters['accountId']!,
+                isLocal: true,
+              ),
+            ),
+            GoRoute(
+              path: ':accountId/sieve/local/edit',
+              builder: (ctx, state) => SieveScriptEditScreen(
+                accountId: state.pathParameters['accountId']!,
+                script: state.extra as SieveScript?,
+                isLocal: true,
+              ),
+            ),
             GoRoute(
               path: ':accountId/search',
               builder: (ctx, state) =>

lib/ui/screens/about_screen.dart

@@ -0,0 +1,212 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_markdown/flutter_markdown.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:package_info_plus/package_info_plus.dart';
+import 'package:sharedinbox/core/models/account.dart';
+import 'package:sharedinbox/di.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+class AboutScreen extends ConsumerStatefulWidget {
+  const AboutScreen({super.key});
+
+  @override
+  ConsumerState<AboutScreen> createState() => _AboutScreenState();
+}
+
+class _AboutScreenState extends ConsumerState<AboutScreen> {
+  final Future<PackageInfo> _packageInfoFuture = PackageInfo.fromPlatform();
+  late final Stream<List<Account>> _accountsStream;
+
+  static const _gitHash = String.fromEnvironment('GIT_HASH');
+
+  @override
+  void initState() {
+    super.initState();
+    _accountsStream = ref.read(accountRepositoryProvider).observeAccounts();
+  }
+
+  String _buildMarkdown(
+    BuildContext context,
+    PackageInfo? pkg,
+    int imapCount,
+    int jmapCount,
+  ) {
+    final size = MediaQuery.of(context).size;
+    final pixelRatio = MediaQuery.of(context).devicePixelRatio;
+    final physW = (size.width * pixelRatio).toInt();
+    final physH = (size.height * pixelRatio).toInt();
+    final version =
+        pkg != null ? '${pkg.version}+${pkg.buildNumber}' : 'unknown';
+    final versionDisplay = _gitHash.isNotEmpty
+        ? '[$version](https://codeberg.org/guettli/sharedinbox/commit/$_gitHash)'
+        : version;
+    final osName = _capitalize(Platform.operatingSystem);
+    final isDark = MediaQuery.of(context).platformBrightness == Brightness.dark;
+
+    return '## sharedinbox.de\n\n'
+        '| Property | Value |\n'
+        '|----------|-------|\n'
+        '| App Version | $versionDisplay |\n'
+        '| Platform | ${Platform.operatingSystem} |\n'
+        '| $osName Version | ${Platform.operatingSystemVersion} |\n'
+        '| Resolution | ${physW}x$physH px'
+        ' (logical: ${size.width.toInt()}x${size.height.toInt()} pt,'
+        ' ratio: ${pixelRatio.toStringAsFixed(1)}x) |\n'
+        '| Dart Version | ${Platform.version.split(' ').first} |\n'
+        '| Processors | ${Platform.numberOfProcessors} |\n'
+        '| Dark Mode | ${isDark ? 'yes' : 'no'} |\n'
+        '| IMAP Accounts | $imapCount |\n'
+        '| JMAP Accounts | $jmapCount |\n';
+  }
+
+  static String _capitalize(String s) =>
+      s.isEmpty ? s : '${s[0].toUpperCase()}${s.substring(1)}';
+
+  Future<void> _copyToClipboard(
+    BuildContext context,
+    int imapCount,
+    int jmapCount,
+  ) async {
+    PackageInfo? pkg;
+    try {
+      pkg = await _packageInfoFuture;
+    } catch (_) {}
+    if (!context.mounted) return;
+    await Clipboard.setData(
+      ClipboardData(
+        text: _buildMarkdown(context, pkg, imapCount, jmapCount),
+      ),
+    );
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          duration: Duration(seconds: 5),
+          content: Text('Copied to clipboard'),
+        ),
+      );
+    }
+  }
+
+  Future<void> _createIssue(
+    BuildContext context,
+    int imapCount,
+    int jmapCount,
+  ) async {
+    PackageInfo? pkg;
+    try {
+      pkg = await _packageInfoFuture;
+    } catch (_) {}
+    if (!context.mounted) return;
+    final body = Uri.encodeComponent(
+      _buildMarkdown(context, pkg, imapCount, jmapCount),
+    );
+    final url = Uri.parse(
+      'https://codeberg.org/guettli/sharedinbox/issues/new?body=$body',
+    );
+    try {
+      final launched =
+          await launchUrl(url, mode: LaunchMode.externalApplication);
+      if (!launched && context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            duration: Duration(seconds: 5),
+            content: Text('Could not open browser.'),
+          ),
+        );
+      }
+    } catch (e) {
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            duration: const Duration(seconds: 5),
+            content: Text('Error: $e'),
+          ),
+        );
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return StreamBuilder<List<Account>>(
+      stream: _accountsStream,
+      builder: (context, accountSnapshot) {
+        final accounts = accountSnapshot.data ?? [];
+        final imapCount =
+            accounts.where((a) => a.type == AccountType.imap).length;
+        final jmapCount =
+            accounts.where((a) => a.type == AccountType.jmap).length;
+
+        return Scaffold(
+          appBar: AppBar(title: const Text('About')),
+          body: Column(
+            children: [
+              Expanded(
+                child: FutureBuilder<PackageInfo>(
+                  future: _packageInfoFuture,
+                  builder: (context, snapshot) {
+                    if (snapshot.connectionState == ConnectionState.waiting) {
+                      return const Center(child: CircularProgressIndicator());
+                    }
+                    return Markdown(
+                      data: _buildMarkdown(
+                        context,
+                        snapshot.data,
+                        imapCount,
+                        jmapCount,
+                      ),
+                      selectable: true,
+                      onTapLink: (text, href, title) {
+                        if (href != null) {
+                          unawaited(
+                            launchUrl(
+                              Uri.parse(href),
+                              mode: LaunchMode.externalApplication,
+                            ),
+                          );
+                        }
+                      },
+                    );
+                  },
+                ),
+              ),
+              Padding(
+                padding: const EdgeInsets.symmetric(
+                  horizontal: 16,
+                  vertical: 12,
+                ),
+                child: Row(
+                  children: [
+                    Expanded(
+                      child: OutlinedButton.icon(
+                        icon: const Icon(Icons.copy),
+                        label: const Text('Copy to clipboard'),
+                        onPressed: () => unawaited(
+                          _copyToClipboard(context, imapCount, jmapCount),
+                        ),
+                      ),
+                    ),
+                    const SizedBox(width: 8),
+                    Expanded(
+                      child: FilledButton.icon(
+                        icon: const Icon(Icons.bug_report),
+                        label: const Text('Create issue'),
+                        onPressed: () => unawaited(
+                          _createIssue(context, imapCount, jmapCount),
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        );
+      },
+    );
+  }
+}

lib/ui/screens/account_list_screen.dart

@@ -3,9 +3,10 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
-
 import 'package:sharedinbox/core/models/account.dart';
+import 'package:sharedinbox/core/services/update_service.dart';
 import 'package:sharedinbox/di.dart';
+import 'package:url_launcher/url_launcher.dart';
 
 class AccountListScreen extends ConsumerWidget {
   const AccountListScreen({super.key});
@@ -14,7 +15,7 @@ class AccountListScreen extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('SharedInbox'),
+        title: const Text('sharedinbox.de'),
         actions: [
           IconButton(
             icon: const Icon(Icons.search),
@@ -29,10 +30,18 @@ class AccountListScreen extends ConsumerWidget {
             const DrawerHeader(
               decoration: BoxDecoration(color: Colors.blueGrey),
               child: Text(
-                'SharedInbox',
+                'sharedinbox.de',
                 style: TextStyle(color: Colors.white, fontSize: 24),
               ),
             ),
+            ListTile(
+              leading: const Icon(Icons.qr_code_scanner),
+              title: const Text('Receive accounts'),
+              onTap: () {
+                Navigator.pop(context);
+                unawaited(context.push('/accounts/receive'));
+              },
+            ),
             ListTile(
               leading: const Icon(Icons.history),
               title: const Text('Undo Log'),
@@ -49,37 +58,39 @@ class AccountListScreen extends ConsumerWidget {
                 unawaited(context.push('/accounts/changelog'));
               },
             ),
+            ListTile(
+              leading: const Icon(Icons.info_outline),
+              title: const Text('About'),
+              onTap: () {
+                Navigator.pop(context); // Close drawer
+                unawaited(context.push('/accounts/about'));
+              },
+            ),
           ],
         ),
       ),
-      body: StreamBuilder(
-        stream: ref.watch(accountRepositoryProvider).observeAccounts(),
-        builder: (ctx, snap) {
-          if (!snap.hasData) {
-            return const Center(child: CircularProgressIndicator());
-          }
-          final accounts = snap.data!;
-          if (accounts.isEmpty) {
-            return Center(
-              child: Column(
-                mainAxisSize: MainAxisSize.min,
-                children: [
-                  const Text('No accounts yet.'),
-                  const SizedBox(height: 12),
-                  FilledButton.icon(
-                    onPressed: () => context.push('/accounts/add'),
-                    icon: const Icon(Icons.add),
-                    label: const Text('Add account'),
-                  ),
-                ],
-              ),
-            );
-          }
-          return ListView.builder(
-            itemCount: accounts.length,
-            itemBuilder: (ctx, i) => _AccountTile(account: accounts[i]),
-          );
-        },
+      body: Column(
+        children: [
+          const _UpdateBanner(),
+          Expanded(
+            child: StreamBuilder(
+              stream: ref.watch(accountRepositoryProvider).observeAccounts(),
+              builder: (ctx, snap) {
+                if (!snap.hasData) {
+                  return const Center(child: CircularProgressIndicator());
+                }
+                final accounts = snap.data!;
+                if (accounts.isEmpty) {
+                  return const _OnboardingView();
+                }
+                return ListView.builder(
+                  itemCount: accounts.length,
+                  itemBuilder: (ctx, i) => _AccountTile(account: accounts[i]),
+                );
+              },
+            ),
+          ),
+        ],
       ),
       floatingActionButton: FloatingActionButton(
         onPressed: () => context.push('/accounts/add'),
@@ -159,15 +170,27 @@ class _AccountTile extends ConsumerWidget {
                 value: _AccountAction.verifySync,
                 child: Text('Verify sync health'),
               ),
+              const PopupMenuItem(
+                value: _AccountAction.forceSync,
+                child: Text('Force full sync'),
+              ),
               const PopupMenuItem(
                 value: _AccountAction.edit,
                 child: Text('Edit'),
               ),
               if (_sieveSupported(account))
                 const PopupMenuItem(
-                  value: _AccountAction.emailFilters,
-                  child: Text('Email filters'),
+                  value: _AccountAction.emailFiltersRemote,
+                  child: Text('Server email filters'),
                 ),
+              const PopupMenuItem(
+                value: _AccountAction.emailFiltersLocal,
+                child: Text('Local email filters'),
+              ),
+              const PopupMenuItem(
+                value: _AccountAction.send,
+                child: Text('Send accounts'),
+              ),
               const PopupMenuDivider(),
               const PopupMenuItem(
                 value: _AccountAction.delete,
@@ -194,16 +217,53 @@ class _AccountTile extends ConsumerWidget {
         );
         if (context.mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
-            const SnackBar(content: Text('Starting sync verification...')),
+            const SnackBar(
+              duration: Duration(seconds: 5),
+              content: Text('Starting sync verification...'),
+            ),
           );
         }
         break;
+      case _AccountAction.forceSync:
+        final confirmed = await showDialog<bool>(
+          context: context,
+          builder: (ctx) => AlertDialog(
+            title: const Text('Force full sync?'),
+            content: const Text(
+              'This clears all locally-cached emails and mailboxes for this '
+              'account and immediately re-downloads everything from the server. '
+              'Previously viewed email content will not need to be re-downloaded.',
+            ),
+            actions: [
+              TextButton(
+                onPressed: () => Navigator.of(ctx).pop(false),
+                child: const Text('Cancel'),
+              ),
+              FilledButton(
+                onPressed: () => Navigator.of(ctx).pop(true),
+                child: const Text('Force sync'),
+              ),
+            ],
+          ),
+        );
+        if (confirmed == true && context.mounted) {
+          await ProviderScope.containerOf(
+            context,
+          ).read(syncManagerProvider).forceResync(account.id);
+        }
+        break;
       case _AccountAction.edit:
         await context.push('/accounts/${account.id}/edit');
         break;
-      case _AccountAction.emailFilters:
+      case _AccountAction.emailFiltersRemote:
         await context.push('/accounts/${account.id}/sieve');
         break;
+      case _AccountAction.emailFiltersLocal:
+        await context.push('/accounts/${account.id}/sieve/local');
+        break;
+      case _AccountAction.send:
+        await context.push('/accounts/send');
+        break;
       case _AccountAction.delete:
         final confirmed = await showDialog<bool>(
           context: context,
@@ -233,7 +293,122 @@ class _AccountTile extends ConsumerWidget {
   }
 }
 
-enum _AccountAction { syncLog, verifySync, edit, emailFilters, delete }
+class _OnboardingView extends StatelessWidget {
+  const _OnboardingView();
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Center(
+      child: SingleChildScrollView(
+        padding: const EdgeInsets.all(24),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(
+              Icons.mail_outline,
+              size: 64,
+              color: theme.colorScheme.primary,
+            ),
+            const SizedBox(height: 16),
+            Text(
+              'Welcome to sharedinbox.de',
+              style: theme.textTheme.headlineSmall,
+              textAlign: TextAlign.center,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Get started in three steps:',
+              style: theme.textTheme.bodyMedium,
+              textAlign: TextAlign.center,
+            ),
+            const SizedBox(height: 24),
+            const _Step(
+              number: '1',
+              title: 'Add an account',
+              description: 'Connect your IMAP or JMAP email account.',
+            ),
+            const _Step(
+              number: '2',
+              title: 'Wait for sync',
+              description:
+                  'sharedinbox.de downloads your messages in the background.',
+            ),
+            const _Step(
+              number: '3',
+              title: 'Open your inbox',
+              description:
+                  'Tap the account to browse mailboxes and read emails.',
+            ),
+            const SizedBox(height: 32),
+            FilledButton.icon(
+              onPressed: () => context.push('/accounts/add'),
+              icon: const Icon(Icons.add),
+              label: const Text('Add account'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _Step extends StatelessWidget {
+  const _Step({
+    required this.number,
+    required this.title,
+    required this.description,
+  });
+
+  final String number;
+  final String title;
+  final String description;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 8),
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          CircleAvatar(
+            radius: 16,
+            backgroundColor: theme.colorScheme.primaryContainer,
+            child: Text(
+              number,
+              style: TextStyle(
+                color: theme.colorScheme.onPrimaryContainer,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+          ),
+          const SizedBox(width: 16),
+          Expanded(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(title, style: theme.textTheme.titleSmall),
+                Text(description, style: theme.textTheme.bodySmall),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+enum _AccountAction {
+  syncLog,
+  verifySync,
+  forceSync,
+  edit,
+  emailFiltersRemote,
+  emailFiltersLocal,
+  send,
+  delete,
+}
 
 /// Whether to surface the "Email filters" (Sieve) entry for [account].
 ///
@@ -245,3 +420,31 @@ bool _sieveSupported(Account account) {
   if (account.type == AccountType.jmap) return true;
   return account.manageSieveAvailable != false;
 }
+
+/// Shown on Linux desktop when a newer build is available on the server.
+class _UpdateBanner extends ConsumerWidget {
+  const _UpdateBanner();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final update = ref.watch(updateInfoProvider);
+    return update.when(
+      data: (info) {
+        if (info == null) return const SizedBox.shrink();
+        return MaterialBanner(
+          content: Text('Update available: ${info.latestVersion}'),
+          leading: const Icon(Icons.system_update),
+          actions: [
+            TextButton(
+              onPressed: () =>
+                  unawaited(launchUrl(Uri.parse(info.downloadUrl))),
+              child: const Text('Download'),
+            ),
+          ],
+        );
+      },
+      loading: () => const SizedBox.shrink(),
+      error: (_, __) => const SizedBox.shrink(),
+    );
+  }
+}

lib/ui/screens/account_receive_screen.dart

@@ -0,0 +1,391 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:qr_flutter/qr_flutter.dart';
+
+import 'package:sharedinbox/core/models/account.dart';
+import 'package:sharedinbox/core/services/share_encryption_service.dart';
+import 'package:sharedinbox/di.dart';
+
+/// Receiving side of the secure account-sharing flow.
+///
+/// Step 1 – generates an X25519 key pair with a 20-minute lifetime and shows
+///           the public key as a QR code to be scanned by the sender.
+///
+/// Step 2 – scans the encrypted-accounts QR code shown by the sender, decrypts
+///           it using the private key, and imports the accounts.
+class AccountReceiveScreen extends ConsumerStatefulWidget {
+  const AccountReceiveScreen({super.key});
+
+  @override
+  ConsumerState<AccountReceiveScreen> createState() =>
+      _AccountReceiveScreenState();
+}
+
+enum _Step { generatingKey, showingPubKey, scanning, importing, done, error }
+
+class _AccountReceiveScreenState extends ConsumerState<AccountReceiveScreen> {
+  _Step _step = _Step.generatingKey;
+  ShareKeyMaterial? _keyMaterial;
+  String? _pubKeyQr;
+  String? _errorMessage;
+  bool _scannerActive = false;
+
+  MobileScannerController? _scannerController;
+
+  @override
+  void initState() {
+    super.initState();
+    unawaited(_generateKey());
+  }
+
+  @override
+  void dispose() {
+    final ctrl = _scannerController;
+    if (ctrl != null) unawaited(ctrl.dispose());
+    super.dispose();
+  }
+
+  Future<void> _generateKey() async {
+    try {
+      final repo = ref.read(shareKeyRepositoryProvider);
+      final material = await repo.createKeyPair();
+      final qr = ShareEncryptionService.encodePublicKeyQr(
+        material.keyId,
+        material.publicKeyBytes,
+      );
+      setState(() {
+        _keyMaterial = material;
+        _pubKeyQr = qr;
+        _step = _Step.showingPubKey;
+      });
+    } catch (e) {
+      setState(() {
+        _errorMessage = e.toString();
+        _step = _Step.error;
+      });
+    }
+  }
+
+  void _startScanning() {
+    setState(() {
+      _step = _Step.scanning;
+      _scannerActive = true;
+      _scannerController = MobileScannerController();
+    });
+  }
+
+  Future<void> _onScanned(String rawValue) async {
+    if (!_scannerActive) return;
+    _scannerActive = false;
+    await _scannerController?.stop();
+
+    setState(() => _step = _Step.importing);
+
+    try {
+      final material = _keyMaterial!;
+      final accounts = await ShareEncryptionService.decryptAccounts(
+        qrString: rawValue,
+        privateKeyBytes: material.privateKeyBytes,
+        publicKeyBytes: material.publicKeyBytes,
+        keyId: material.keyId,
+      );
+
+      final repo = ref.read(accountRepositoryProvider);
+      for (final ap in accounts) {
+        final account = Account.fromJson(ap.accountJson);
+        final newAccount = Account(
+          id: DateTime.now().millisecondsSinceEpoch.toString(),
+          displayName: account.displayName,
+          email: account.email,
+          username: account.username,
+          type: account.type,
+          imapHost: account.imapHost,
+          imapPort: account.imapPort,
+          imapSsl: account.imapSsl,
+          smtpHost: account.smtpHost,
+          smtpPort: account.smtpPort,
+          smtpSsl: account.smtpSsl,
+          manageSieveHost: account.manageSieveHost,
+          manageSievePort: account.manageSievePort,
+          manageSieveSsl: account.manageSieveSsl,
+          jmapUrl: account.jmapUrl,
+        );
+        await repo.addAccount(newAccount, ap.password);
+      }
+
+      if (mounted) {
+        setState(() => _step = _Step.done);
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(
+              'Imported ${accounts.length} account${accounts.length == 1 ? '' : 's'} successfully.',
+            ),
+          ),
+        );
+        context.pop();
+      }
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _errorMessage = _friendlyError(e);
+          _scannerActive = false;
+          // Let user retry from the pubkey step.
+          _step = _Step.showingPubKey;
+        });
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(_friendlyError(e)),
+            backgroundColor: Theme.of(context).colorScheme.error,
+          ),
+        );
+      }
+    }
+  }
+
+  String _friendlyError(Object e) {
+    final s = e.toString();
+    if (s.contains('expired') || s.contains('older than')) {
+      return 'The QR code has expired. Ask the sender to generate a new one.';
+    }
+    if (s.contains('Key ID mismatch') || s.contains('Unknown')) {
+      return 'QR code does not match this session. Regenerate the public key and try again.';
+    }
+    if (s.contains('authentication') ||
+        s.contains('mac') ||
+        s.contains('SecretBox')) {
+      return 'Authentication failed — the QR code may have been tampered with.';
+    }
+    return 'Import failed: $s';
+  }
+
+  // ── Build ──────────────────────────────────────────────────────────────────
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Receive accounts')),
+      body: switch (_step) {
+        _Step.generatingKey => const Center(child: CircularProgressIndicator()),
+        _Step.showingPubKey => _buildPubKeyView(context),
+        _Step.scanning => _buildScannerView(context),
+        _Step.importing => const Center(
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                CircularProgressIndicator(),
+                SizedBox(height: 16),
+                Text('Importing accounts…'),
+              ],
+            ),
+          ),
+        _Step.done => const Center(
+            child: Icon(
+              Icons.check_circle,
+              size: 64,
+              color: Colors.green,
+            ),
+          ),
+        _Step.error => Center(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: Text('Error: $_errorMessage'),
+            ),
+          ),
+      },
+    );
+  }
+
+  Widget _buildPubKeyView(BuildContext context) {
+    final theme = Theme.of(context);
+    return SingleChildScrollView(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text(
+            'Step 1 of 2 — Show this QR code to the sender',
+            style: theme.textTheme.titleMedium,
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 8),
+          Text(
+            'The sender scans this code, selects the account(s) to transfer, '
+            'and shows an encrypted QR code. Then come back here for step 2.',
+            style: theme.textTheme.bodySmall,
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 24),
+          Center(
+            child: Container(
+              color: Colors.white,
+              padding: const EdgeInsets.all(8),
+              child: QrImageView(
+                key: const Key('pubKeyQrCode'),
+                data: _pubKeyQr!,
+                size: 260,
+              ),
+            ),
+          ),
+          const SizedBox(height: 16),
+          OutlinedButton.icon(
+            icon: const Icon(Icons.copy),
+            label: const Text('Copy public key'),
+            onPressed: () {
+              unawaited(Clipboard.setData(ClipboardData(text: _pubKeyQr!)));
+              ScaffoldMessenger.of(context).showSnackBar(
+                const SnackBar(content: Text('Public key copied to clipboard')),
+              );
+            },
+          ),
+          const SizedBox(height: 8),
+          const _ExpiryHint(),
+          const SizedBox(height: 32),
+          if (_errorMessage != null) ...[
+            Text(
+              _errorMessage!,
+              style: TextStyle(color: theme.colorScheme.error),
+              textAlign: TextAlign.center,
+            ),
+            const SizedBox(height: 16),
+          ],
+          FilledButton.icon(
+            key: const Key('scanEncryptedButton'),
+            icon: const Icon(Icons.qr_code_scanner),
+            label: const Text('Step 2 — Scan encrypted QR code'),
+            onPressed: _startScanning,
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildScannerView(BuildContext context) {
+    // On platforms where the camera scanner is not available (Linux desktop),
+    // fall back to a text-input field.
+    if (!_cameraScanSupported()) {
+      return _buildTextFallbackView(context);
+    }
+
+    return Stack(
+      children: [
+        MobileScanner(
+          controller: _scannerController!,
+          onDetect: (capture) {
+            final raw = capture.barcodes.firstOrNull?.rawValue;
+            if (raw != null) unawaited(_onScanned(raw));
+          },
+        ),
+        Positioned(
+          top: 0,
+          left: 0,
+          right: 0,
+          child: Container(
+            color: Colors.black54,
+            padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 16),
+            child: const Text(
+              'Point the camera at the encrypted QR code from the sender\'s device',
+              style: TextStyle(color: Colors.white),
+              textAlign: TextAlign.center,
+            ),
+          ),
+        ),
+        Positioned(
+          bottom: 32,
+          left: 16,
+          right: 16,
+          child: OutlinedButton(
+            style: OutlinedButton.styleFrom(
+              backgroundColor: Colors.black54,
+              foregroundColor: Colors.white,
+            ),
+            onPressed: () {
+              final ctrl = _scannerController;
+              if (ctrl != null) unawaited(ctrl.dispose());
+              _scannerController = null;
+              setState(() {
+                _scannerActive = false;
+                _step = _Step.showingPubKey;
+              });
+            },
+            child: const Text('Cancel'),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildTextFallbackView(BuildContext context) {
+    final ctrl = TextEditingController();
+    final theme = Theme.of(context);
+    return SingleChildScrollView(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text(
+            'Paste the encrypted code from the sender\'s device',
+            style: theme.textTheme.titleMedium,
+          ),
+          const SizedBox(height: 16),
+          TextField(
+            key: const Key('encryptedCodeField'),
+            controller: ctrl,
+            maxLines: 6,
+            decoration: const InputDecoration(
+              labelText: 'Encrypted code',
+              border: OutlineInputBorder(),
+              hintText: 'sharedinbox.de:encrypted-accounts:v1:…',
+            ),
+          ),
+          const SizedBox(height: 16),
+          FilledButton(
+            onPressed: () {
+              final text = ctrl.text.trim();
+              if (text.isNotEmpty) unawaited(_onScanned(text));
+            },
+            child: const Text('Import'),
+          ),
+          const SizedBox(height: 8),
+          OutlinedButton(
+            onPressed: () => setState(() {
+              _scannerActive = false;
+              _step = _Step.showingPubKey;
+            }),
+            child: const Text('Cancel'),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+bool _cameraScanSupported() =>
+    Platform.isAndroid ||
+    Platform.isIOS ||
+    Platform.isMacOS ||
+    Platform.isWindows;
+
+class _ExpiryHint extends StatelessWidget {
+  const _ExpiryHint();
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: [
+        Icon(Icons.timer_outlined, size: 14, color: Colors.grey[600]),
+        const SizedBox(width: 4),
+        Text(
+          'This key expires in 20 minutes',
+          style: TextStyle(fontSize: 12, color: Colors.grey[600]),
+        ),
+      ],
+    );
+  }
+}

lib/ui/screens/account_send_screen.dart

@@ -0,0 +1,355 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:qr_flutter/qr_flutter.dart';
+
+import 'package:sharedinbox/core/models/account.dart';
+import 'package:sharedinbox/core/services/share_encryption_service.dart';
+import 'package:sharedinbox/di.dart';
+
+/// Sending side of the secure account-sharing flow.
+///
+/// Step 1 – scans (or pastes) the receiver's public-key QR code.
+///
+/// Step 2 – if more than one account exists, the user selects which accounts
+///           to transfer (auto-selected when only one account is present).
+///
+/// Step 3 – shows the encrypted-accounts QR code for the receiver to scan.
+class AccountSendScreen extends ConsumerStatefulWidget {
+  const AccountSendScreen({super.key});
+
+  @override
+  ConsumerState<AccountSendScreen> createState() => _AccountSendScreenState();
+}
+
+enum _Step { scanning, selectAccounts, showEncrypted, error }
+
+class _AccountSendScreenState extends ConsumerState<AccountSendScreen> {
+  _Step _step = _Step.scanning;
+
+  // Set after scanning the pubkey QR.
+  Uint8List? _recipientKeyId;
+  Uint8List? _recipientPublicKey;
+
+  // All available accounts + the selection (for step 2).
+  List<Account> _accounts = [];
+  final Set<String> _selectedIds = {};
+
+  // Set after encryption (step 3).
+  String? _encryptedQr;
+  String? _errorMessage;
+  bool _scannerActive = true;
+
+  MobileScannerController? _scannerController;
+
+  @override
+  void initState() {
+    super.initState();
+    if (_cameraScanSupported()) {
+      _scannerController = MobileScannerController();
+    }
+  }
+
+  @override
+  void dispose() {
+    final ctrl = _scannerController;
+    if (ctrl != null) unawaited(ctrl.dispose());
+    super.dispose();
+  }
+
+  // ── Step 1: scan pubkey QR ──────────────────────────────────────────────────
+
+  Future<void> _onPubKeyScanned(String rawValue) async {
+    if (!_scannerActive) return;
+    _scannerActive = false;
+    await _scannerController?.stop();
+
+    final parsed = ShareEncryptionService.parsePublicKeyQr(rawValue);
+    if (parsed == null) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            content: Text(
+              'Not a valid sharedinbox.de public-key QR code. '
+              'Ask the receiver to show step 1 of "Receive accounts".',
+            ),
+          ),
+        );
+        // Allow retry.
+        setState(() => _scannerActive = true);
+        await _scannerController?.start();
+      }
+      return;
+    }
+
+    // Load all available accounts.
+    final accounts =
+        await ref.read(accountRepositoryProvider).observeAccounts().first;
+
+    if (!mounted) return;
+
+    if (accounts.isEmpty) {
+      setState(() {
+        _errorMessage = 'No accounts to send.';
+        _step = _Step.error;
+      });
+      return;
+    }
+
+    setState(() {
+      _recipientKeyId = parsed.keyId;
+      _recipientPublicKey = parsed.publicKeyBytes;
+      _accounts = accounts;
+    });
+
+    if (accounts.length == 1) {
+      // Auto-select the only account; skip the selection step.
+      _selectedIds.add(accounts.first.id);
+      await _encryptAndShow();
+    } else {
+      setState(() {
+        _selectedIds.addAll(accounts.map((a) => a.id));
+        _step = _Step.selectAccounts;
+      });
+    }
+  }
+
+  // ── Step 2: account selection ───────────────────────────────────────────────
+
+  Future<void> _encryptAndShow() async {
+    final repo = ref.read(accountRepositoryProvider);
+    final selected = _accounts.where((a) => _selectedIds.contains(a.id));
+
+    final payloads = <AccountPayload>[];
+    for (final account in selected) {
+      final password = await repo.getPassword(account.id);
+      payloads.add(
+        AccountPayload(
+          accountJson: account.toJson(),
+          password: password,
+        ),
+      );
+    }
+
+    try {
+      final qr = await ShareEncryptionService.encryptAccounts(
+        recipientKeyId: _recipientKeyId!,
+        recipientPublicKeyBytes: _recipientPublicKey!,
+        accounts: payloads,
+      );
+      if (mounted) {
+        setState(() {
+          _encryptedQr = qr;
+          _step = _Step.showEncrypted;
+        });
+      }
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _errorMessage = e.toString();
+          _step = _Step.error;
+        });
+      }
+    }
+  }
+
+  // ── Build ───────────────────────────────────────────────────────────────────
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Send accounts')),
+      body: switch (_step) {
+        _Step.scanning => _buildScanStep(context),
+        _Step.selectAccounts => _buildSelectStep(context),
+        _Step.showEncrypted => _buildEncryptedQrStep(context),
+        _Step.error => Center(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: Text('Error: $_errorMessage'),
+            ),
+          ),
+      },
+    );
+  }
+
+  Widget _buildScanStep(BuildContext context) {
+    if (!_cameraScanSupported()) {
+      return _buildTextFallbackView(context);
+    }
+
+    return Stack(
+      children: [
+        MobileScanner(
+          controller: _scannerController!,
+          onDetect: (capture) {
+            final raw = capture.barcodes.firstOrNull?.rawValue;
+            if (raw != null) unawaited(_onPubKeyScanned(raw));
+          },
+        ),
+        Positioned(
+          top: 0,
+          left: 0,
+          right: 0,
+          child: Container(
+            color: Colors.black54,
+            padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 16),
+            child: const Text(
+              'Point the camera at the public-key QR code shown by the receiver',
+              style: TextStyle(color: Colors.white),
+              textAlign: TextAlign.center,
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildTextFallbackView(BuildContext context) {
+    final ctrl = TextEditingController();
+    return SingleChildScrollView(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          const Text(
+            'Paste the public key shown by the receiver\'s "Receive accounts" screen.',
+          ),
+          const SizedBox(height: 16),
+          TextField(
+            key: const Key('pubKeyInputField'),
+            controller: ctrl,
+            maxLines: 4,
+            decoration: const InputDecoration(
+              labelText: 'Public key',
+              border: OutlineInputBorder(),
+              hintText: 'sharedinbox.de:pubkey:v1:…',
+            ),
+          ),
+          const SizedBox(height: 16),
+          FilledButton(
+            onPressed: () {
+              final text = ctrl.text.trim();
+              if (text.isNotEmpty) unawaited(_onPubKeyScanned(text));
+            },
+            child: const Text('Continue'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildSelectStep(BuildContext context) {
+    final theme = Theme.of(context);
+    return Column(
+      children: [
+        Padding(
+          padding: const EdgeInsets.all(16),
+          child: Text(
+            'Select accounts to send',
+            style: theme.textTheme.titleMedium,
+          ),
+        ),
+        Expanded(
+          child: ListView(
+            children: _accounts.map((account) {
+              final selected = _selectedIds.contains(account.id);
+              return CheckboxListTile(
+                value: selected,
+                title: Text(account.displayName),
+                subtitle: Text(account.email),
+                onChanged: (v) {
+                  setState(() {
+                    if (v == true) {
+                      _selectedIds.add(account.id);
+                    } else {
+                      _selectedIds.remove(account.id);
+                    }
+                  });
+                },
+              );
+            }).toList(),
+          ),
+        ),
+        Padding(
+          padding: const EdgeInsets.all(16),
+          child: FilledButton(
+            key: const Key('sendSelectedButton'),
+            onPressed: _selectedIds.isEmpty
+                ? null
+                : () => unawaited(_encryptAndShow()),
+            child: const Text('Encrypt & show QR'),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildEncryptedQrStep(BuildContext context) {
+    final theme = Theme.of(context);
+    return SingleChildScrollView(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text(
+            'Step 3 — Show this QR code to the receiver',
+            style: theme.textTheme.titleMedium,
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 8),
+          Text(
+            'The receiver taps "Step 2 — Scan encrypted QR code" and scans this.',
+            style: theme.textTheme.bodySmall,
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 24),
+          Center(
+            child: Container(
+              color: Colors.white,
+              padding: const EdgeInsets.all(8),
+              child: QrImageView(
+                key: const Key('encryptedAccountsQrCode'),
+                data: _encryptedQr!,
+                size: 280,
+              ),
+            ),
+          ),
+          const SizedBox(height: 16),
+          OutlinedButton.icon(
+            key: const Key('copyEncryptedButton'),
+            icon: const Icon(Icons.copy),
+            label: const Text('Copy encrypted code'),
+            onPressed: () {
+              unawaited(Clipboard.setData(ClipboardData(text: _encryptedQr!)));
+              ScaffoldMessenger.of(context).showSnackBar(
+                const SnackBar(
+                  content: Text(
+                    'Encrypted code copied to clipboard',
+                  ),
+                ),
+              );
+            },
+          ),
+          const SizedBox(height: 8),
+          Text(
+            'This code contains encrypted account data. It is safe to display '
+            'briefly — only the receiver\'s device can decrypt it.',
+            style: theme.textTheme.bodySmall,
+            textAlign: TextAlign.center,
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+bool _cameraScanSupported() =>
+    Platform.isAndroid ||
+    Platform.isIOS ||
+    Platform.isMacOS ||
+    Platform.isWindows;

lib/ui/screens/add_account_screen.dart

@@ -295,6 +295,13 @@ class _AddAccountScreenState extends ConsumerState<AddAccountScreen> {
               onPressed: _detectAccount,
               child: const Text('Continue'),
             ),
+            const SizedBox(height: 8),
+            OutlinedButton.icon(
+              key: const Key('importAccountButton'),
+              icon: const Icon(Icons.qr_code_scanner),
+              label: const Text('Receive account'),
+              onPressed: () => context.push('/accounts/receive'),
+            ),
           ],
         ),
       ),

lib/ui/screens/compose_screen.dart

@@ -39,6 +39,8 @@ class ComposeScreen extends ConsumerStatefulWidget {
 class _ComposeScreenState extends ConsumerState<ComposeScreen> {
   final _to = TextEditingController();
   final _cc = TextEditingController();
+  final _toFocus = FocusNode();
+  final _ccFocus = FocusNode();
   final _subject = TextEditingController();
   final _body = TextEditingController();
   String? _accountId;
@@ -139,6 +141,8 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
       c.removeListener(_onTextChanged);
       c.dispose();
     }
+    _toFocus.dispose();
+    _ccFocus.dispose();
     // Flush any pending save synchronously — we can't await in dispose, but
     // scheduling a microtask still runs before the isolate exits.
     if (_draftDirty) {
@@ -192,7 +196,12 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
       if (!mounted) return;
       ScaffoldMessenger.of(
         context,
-      ).showSnackBar(SnackBar(content: Text('Failed to open file: $e')));
+      ).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Text('Failed to open file: $e'),
+        ),
+      );
     } finally {
       if (mounted) setState(() => _opening = false);
     }
@@ -206,7 +215,12 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
     if (_accountId == null) {
       ScaffoldMessenger.of(
         context,
-      ).showSnackBar(const SnackBar(content: Text('Select an account first')));
+      ).showSnackBar(
+        const SnackBar(
+          duration: Duration(seconds: 5),
+          content: Text('Select an account first'),
+        ),
+      );
       return;
     }
     setState(() => _sending = true);
@@ -243,7 +257,12 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
       if (!mounted) return;
       ScaffoldMessenger.of(
         context,
-      ).showSnackBar(SnackBar(content: Text('Send failed: $e')));
+      ).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Text('Send failed: $e'),
+        ),
+      );
     } finally {
       if (mounted) setState(() => _sending = false);
     }
@@ -315,8 +334,8 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
                 ),
               ),
             ),
-          _field(_to, 'To', keyboardType: TextInputType.emailAddress),
-          _field(_cc, 'Cc', keyboardType: TextInputType.emailAddress),
+          _addressField(_to, _toFocus, 'To'),
+          _addressField(_cc, _ccFocus, 'Cc'),
           _field(_subject, 'Subject'),
           const SizedBox(height: 8),
           TextFormField(
@@ -369,6 +388,96 @@ class _ComposeScreenState extends ConsumerState<ComposeScreen> {
     );
   }
 
+  Widget _addressField(
+    TextEditingController ctrl,
+    FocusNode focusNode,
+    String label,
+  ) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 6),
+      child: RawAutocomplete<EmailAddress>(
+        textEditingController: ctrl,
+        focusNode: focusNode,
+        displayStringForOption: (option) {
+          final text = ctrl.text;
+          final lastComma = text.lastIndexOf(',');
+          final prefix =
+              lastComma >= 0 ? '${text.substring(0, lastComma + 1)} ' : '';
+          return '$prefix${option.email}, ';
+        },
+        optionsBuilder: (value) async {
+          final text = value.text;
+          final lastComma = text.lastIndexOf(',');
+          final token = lastComma >= 0
+              ? text.substring(lastComma + 1).trim()
+              : text.trim();
+          if (token.length < 2) return const [];
+          final results = await ref
+              .read(emailRepositoryProvider)
+              .searchAddresses(null, token);
+          // Guard: if focus left the field while the query was running,
+          // return empty so RawAutocomplete doesn't call show() after hide()
+          // has already been called — that races into an assertion in overlay.dart.
+          if (!focusNode.hasFocus) return const [];
+          return results;
+        },
+        fieldViewBuilder: (ctx, fieldCtrl, fieldFocusNode, onFieldSubmitted) {
+          return TextFormField(
+            controller: fieldCtrl,
+            focusNode: fieldFocusNode,
+            keyboardType: TextInputType.emailAddress,
+            decoration: InputDecoration(
+              labelText: label,
+              border: const OutlineInputBorder(),
+            ),
+            onFieldSubmitted: (_) => onFieldSubmitted(),
+          );
+        },
+        optionsViewBuilder: (ctx, onSelected, options) {
+          return Align(
+            alignment: Alignment.topLeft,
+            child: Material(
+              elevation: 4,
+              child: ConstrainedBox(
+                constraints: const BoxConstraints(maxHeight: 200),
+                child: ListView.builder(
+                  padding: EdgeInsets.zero,
+                  shrinkWrap: true,
+                  itemCount: options.length,
+                  itemBuilder: (ctx, i) {
+                    final option = options.elementAt(i);
+                    return InkWell(
+                      onTap: () => onSelected(option),
+                      child: Padding(
+                        padding: const EdgeInsets.symmetric(
+                          horizontal: 16,
+                          vertical: 8,
+                        ),
+                        child: option.name != null
+                            ? Column(
+                                crossAxisAlignment: CrossAxisAlignment.start,
+                                mainAxisSize: MainAxisSize.min,
+                                children: [
+                                  Text(option.name!),
+                                  Text(
+                                    option.email,
+                                    style: const TextStyle(fontSize: 12),
+                                  ),
+                                ],
+                              )
+                            : Text(option.email),
+                      ),
+                    );
+                  },
+                ),
+              ),
+            ),
+          );
+        },
+      ),
+    );
+  }
+
   Widget _field(
     TextEditingController ctrl,
     String label, {

lib/ui/screens/crash_screen.dart

@@ -1,5 +1,8 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:package_info_plus/package_info_plus.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 class CrashScreen extends StatelessWidget {
@@ -12,6 +15,20 @@ class CrashScreen extends StatelessWidget {
   final Object exception;
   final StackTrace? stackTrace;
 
+  Future<String> _buildReport() async {
+    String version = 'unknown';
+    try {
+      final info = await PackageInfo.fromPlatform();
+      version = '${info.version}+${info.buildNumber}';
+    } catch (_) {}
+    final platform =
+        '${Platform.operatingSystem} ${Platform.operatingSystemVersion}';
+    return 'App Version: $version\n'
+        'Platform: $platform\n\n'
+        'Error:\n```\n$exception\n```\n\n'
+        'Stack Trace:\n```\n$stackTrace\n```';
+  }
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -28,7 +45,7 @@ class CrashScreen extends StatelessWidget {
               const Icon(Icons.error_outline, color: Colors.red, size: 64),
               const SizedBox(height: 16),
               Text(
-                'SharedInbox encountered an unexpected error and needs to be restarted.',
+                'sharedinbox.de encountered an unexpected error and needs to be restarted.',
                 style: Theme.of(context).textTheme.titleMedium,
                 textAlign: TextAlign.center,
               ),
@@ -74,11 +91,14 @@ class CrashScreen extends StatelessWidget {
               const SizedBox(height: 24),
               FilledButton.icon(
                 onPressed: () async {
-                  final data = 'Error: $exception\n\nStack Trace:\n$stackTrace';
+                  final data = await _buildReport();
                   await Clipboard.setData(ClipboardData(text: data));
                   if (context.mounted) {
                     ScaffoldMessenger.of(context).showSnackBar(
-                      const SnackBar(content: Text('Copied to clipboard')),
+                      const SnackBar(
+                        duration: Duration(seconds: 5),
+                        content: Text('Copied to clipboard'),
+                      ),
                     );
                   }
                 },
@@ -88,12 +108,11 @@ class CrashScreen extends StatelessWidget {
               const SizedBox(height: 16),
               OutlinedButton.icon(
                 onPressed: () async {
+                  final report = await _buildReport();
                   final title = Uri.encodeComponent(
                     'Crash: ${exception.toString().split('\n').first}',
                   );
-                  final body = Uri.encodeComponent(
-                    'Error: $exception\n\nStack Trace:\n$stackTrace',
-                  );
+                  final body = Uri.encodeComponent(report);
                   final url = Uri.parse(
                     'https://codeberg.org/guettli/sharedinbox/issues/new?title=$title&body=$body',
                   );
@@ -105,15 +124,19 @@ class CrashScreen extends StatelessWidget {
                     if (!launched && context.mounted) {
                       ScaffoldMessenger.of(context).showSnackBar(
                         const SnackBar(
+                          duration: Duration(seconds: 5),
                           content: Text('Could not open browser.'),
                         ),
                       );
                     }
                   } catch (e) {
                     if (context.mounted) {
-                      ScaffoldMessenger.of(
-                        context,
-                      ).showSnackBar(SnackBar(content: Text('Error: $e')));
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(
+                          duration: const Duration(seconds: 5),
+                          content: Text('Error: $e'),
+                        ),
+                      );
                     }
                   }
                 },

lib/ui/screens/edit_account_screen.dart

@@ -43,7 +43,6 @@ class _EditAccountScreenState extends ConsumerState<EditAccountScreen> {
   bool _tryTesting = false;
   String? _tryOk;
   String? _tryErr;
-  bool _resyncing = false;
 
   @override
   void initState() {
@@ -171,43 +170,6 @@ class _EditAccountScreenState extends ConsumerState<EditAccountScreen> {
     }
   }
 
-  Future<void> _forceResync() async {
-    final confirmed = await showDialog<bool>(
-      context: context,
-      builder: (ctx) => AlertDialog(
-        title: const Text('Force full sync?'),
-        content: const Text(
-          'This clears all locally-cached emails and mailboxes for this '
-          'account and immediately re-downloads everything from the server. '
-          'Previously viewed email content will not need to be re-downloaded.',
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(ctx).pop(false),
-            child: const Text('Cancel'),
-          ),
-          FilledButton(
-            onPressed: () => Navigator.of(ctx).pop(true),
-            child: const Text('Force sync'),
-          ),
-        ],
-      ),
-    );
-    if (confirmed != true || !mounted) return;
-    setState(() => _resyncing = true);
-    try {
-      await ref.read(syncManagerProvider).forceResync(widget.accountId);
-      if (mounted) context.pop();
-    } catch (e) {
-      if (mounted) {
-        setState(() {
-          _resyncing = false;
-          _errorMessage = 'Force sync failed: $e';
-        });
-      }
-    }
-  }
-
   Future<void> _save() async {
     if (!_formKey.currentState!.validate()) return;
     final password = _passwordCtrl.text.isNotEmpty ? _passwordCtrl.text : null;
@@ -268,7 +230,7 @@ class _EditAccountScreenState extends ConsumerState<EditAccountScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(title: const Text('Edit account')),
-      body: _loading || _saving || _resyncing
+      body: _loading || _saving
           ? const Center(child: CircularProgressIndicator())
           : _buildForm(),
     );
@@ -387,15 +349,6 @@ class _EditAccountScreenState extends ConsumerState<EditAccountScreen> {
             ),
             const SizedBox(height: 8),
             FilledButton(onPressed: _save, child: const Text('Save')),
-            const SizedBox(height: 8),
-            OutlinedButton.icon(
-              icon: const Icon(Icons.sync_problem),
-              label: const Text('Force full sync'),
-              style: OutlinedButton.styleFrom(
-                foregroundColor: Theme.of(context).colorScheme.error,
-              ),
-              onPressed: _forceResync,
-            ),
           ],
         ),
       ),

lib/ui/screens/email_detail_screen.dart

@@ -1,17 +1,22 @@
 import 'dart:async';
+import 'dart:io';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_html/flutter_html.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import 'package:open_filex/open_filex.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:share_plus/share_plus.dart';
 
 import 'package:sharedinbox/core/models/email.dart';
 import 'package:sharedinbox/core/models/undo_action.dart';
 import 'package:sharedinbox/core/utils/format_utils.dart';
 import 'package:sharedinbox/core/utils/html_utils.dart';
 import 'package:sharedinbox/di.dart';
+import 'package:sharedinbox/ui/widgets/secure_email_webview.dart';
 import 'package:sharedinbox/ui/widgets/snooze_picker.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -26,144 +31,153 @@ class EmailDetailScreen extends ConsumerStatefulWidget {
 }
 
 class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
-  late final Future<(Email?, EmailBody)> _dataFuture;
   bool _isFlagged = false;
   bool _loadRemoteImages = false;
   final Set<String> _downloading = {};
 
-  @override
-  void initState() {
-    super.initState();
-    final repo = ref.read(emailRepositoryProvider);
-    _dataFuture = Future.wait([
-      repo.getEmail(widget.emailId),
-      repo.getEmailBody(widget.emailId),
-    ]).then((results) {
-      final email = results[0] as Email?;
-      if (email != null && mounted) {
-        setState(() => _isFlagged = email.isFlagged);
-      }
-      return (email, results[1] as EmailBody);
-    });
-    unawaited(repo.setFlag(widget.emailId, seen: true));
-  }
-
   @override
   Widget build(BuildContext context) {
     final repo = ref.watch(emailRepositoryProvider);
-    return FutureBuilder<(Email?, EmailBody)>(
-      future: _dataFuture,
-      builder: (ctx, snap) {
-        final header = snap.data?.$1;
-        final body = snap.data?.$2;
+    final detail = ref.watch(emailDetailProvider(widget.emailId));
 
-        return Scaffold(
-          appBar: AppBar(
-            title: Text(
-              header?.subject ?? '(loading…)',
-              overflow: TextOverflow.ellipsis,
+    ref.listen<AsyncValue<(Email?, EmailBody)>>(
+      emailDetailProvider(widget.emailId),
+      (_, next) {
+        final email = next.valueOrNull?.$1;
+        if (email != null && mounted) {
+          setState(() => _isFlagged = email.isFlagged);
+        }
+      },
+    );
+
+    final header = detail.valueOrNull?.$1;
+    final body = detail.valueOrNull?.$2;
+
+    final isMobile = defaultTargetPlatform == TargetPlatform.android ||
+        defaultTargetPlatform == TargetPlatform.iOS;
+
+    return Scaffold(
+      appBar: AppBar(
+        automaticallyImplyLeading: !isMobile,
+        title: Text(
+          header?.subject ?? '(loading…)',
+          overflow: TextOverflow.ellipsis,
+        ),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.reply),
+            tooltip: 'Reply',
+            onPressed: header == null
+                ? null
+                : () {
+                    unawaited(_reply(context, header, body, replyAll: false));
+                  },
+          ),
+          IconButton(
+            icon: const Icon(Icons.reply_all),
+            tooltip: 'Reply all',
+            onPressed: header == null
+                ? null
+                : () {
+                    unawaited(_reply(context, header, body, replyAll: true));
+                  },
+          ),
+          IconButton(
+            icon: const Icon(Icons.forward),
+            tooltip: 'Forward',
+            onPressed: header == null
+                ? null
+                : () {
+                    unawaited(_forward(context, header, body));
+                  },
+          ),
+          IconButton(
+            icon: const Icon(Icons.mark_email_unread_outlined),
+            tooltip: 'Mark as unread',
+            onPressed: () async {
+              await repo.setFlag(widget.emailId, seen: false);
+              if (context.mounted) context.pop();
+            },
+          ),
+          IconButton(
+            icon: Icon(
+              _isFlagged ? Icons.star : Icons.star_border,
+              color: _isFlagged ? Colors.amber : null,
             ),
-            actions: [
-              IconButton(
-                icon: const Icon(Icons.reply),
-                tooltip: 'Reply',
-                onPressed: header == null
-                    ? null
-                    : () => _reply(context, header, body, replyAll: false),
-              ),
-              IconButton(
-                icon: const Icon(Icons.reply_all),
-                tooltip: 'Reply all',
-                onPressed: header == null
-                    ? null
-                    : () => _reply(context, header, body, replyAll: true),
-              ),
-              IconButton(
-                icon: const Icon(Icons.forward),
-                tooltip: 'Forward',
-                onPressed: header == null
-                    ? null
-                    : () => _forward(context, header, body),
-              ),
-              IconButton(
-                icon: const Icon(Icons.mark_email_unread_outlined),
-                tooltip: 'Mark as unread',
-                onPressed: () async {
-                  await repo.setFlag(widget.emailId, seen: false);
-                  if (context.mounted) context.pop();
-                },
-              ),
-              IconButton(
-                icon: Icon(
-                  _isFlagged ? Icons.star : Icons.star_border,
-                  color: _isFlagged ? Colors.amber : null,
-                ),
-                tooltip: _isFlagged ? 'Unflag' : 'Flag',
-                onPressed: () async {
-                  final next = !_isFlagged;
-                  await repo.setFlag(widget.emailId, flagged: next);
-                  if (mounted) setState(() => _isFlagged = next);
-                },
-              ),
-              IconButton(
-                icon: const Icon(Icons.drive_file_move_outline),
-                tooltip: 'Move to folder',
-                onPressed:
-                    header == null ? null : () => _moveTo(context, header),
-              ),
-              IconButton(
-                icon: const Icon(Icons.access_time),
-                tooltip: 'Snooze',
-                onPressed:
-                    header == null ? null : () => _snooze(context, header),
-              ),
-              IconButton(
-                icon: const Icon(Icons.delete),
-                tooltip: 'Delete',
-                onPressed: () async {
-                  final destPath = await repo.deleteEmail(widget.emailId);
+            tooltip: _isFlagged ? 'Unflag' : 'Flag',
+            onPressed: () async {
+              final next = !_isFlagged;
+              await repo.setFlag(widget.emailId, flagged: next);
+              if (mounted) setState(() => _isFlagged = next);
+            },
+          ),
+          IconButton(
+            icon: const Icon(Icons.drive_file_move_outline),
+            tooltip: 'Move to folder',
+            onPressed: header == null ? null : () => _moveTo(context, header),
+          ),
+          IconButton(
+            icon: const Icon(Icons.access_time),
+            tooltip: 'Snooze',
+            onPressed: header == null ? null : () => _snooze(context, header),
+          ),
+          IconButton(
+            icon: const Icon(Icons.delete),
+            tooltip: 'Delete',
+            onPressed: () async {
+              final destPath = await repo.deleteEmail(widget.emailId);
 
-                  if (header != null) {
-                    unawaited(
-                      ref.read(undoServiceProvider.notifier).pushAction(
-                            UndoAction(
-                              id: DateTime.now().toIso8601String(),
-                              accountId: header.accountId,
-                              type: UndoType.delete,
-                              emailIds: [widget.emailId],
-                              sourceMailboxPath: header.mailboxPath,
-                              destinationMailboxPath: destPath,
-                              originalEmails: [header],
-                            ),
-                          ),
-                    );
-                  }
+              if (header != null) {
+                unawaited(
+                  ref.read(undoServiceProvider.notifier).pushAction(
+                        UndoAction(
+                          id: DateTime.now().toIso8601String(),
+                          accountId: header.accountId,
+                          type: UndoType.delete,
+                          emailIds: [widget.emailId],
+                          sourceMailboxPath: header.mailboxPath,
+                          destinationMailboxPath: destPath,
+                          originalEmails: [header],
+                        ),
+                      ),
+                );
+              }
 
-                  if (context.mounted) context.pop();
-                },
+              if (context.mounted) context.pop();
+            },
+          ),
+          PopupMenuButton<String>(
+            itemBuilder: (ctx) => [
+              const PopupMenuItem(
+                value: 'headers',
+                child: Text('Show Mail Headers'),
               ),
-              PopupMenuButton<String>(
-                itemBuilder: (ctx) => [
-                  const PopupMenuItem(
-                    value: 'headers',
-                    child: Text('Show Mail Headers'),
-                  ),
-                ],
-                onSelected: (value) {
-                  if (value == 'headers' && body != null) {
-                    _showHeaders(context, body);
-                  }
-                },
+              const PopupMenuItem(
+                value: 'structure',
+                child: Text('Show Mail Structure'),
+              ),
+              const PopupMenuItem(
+                value: 'rfc',
+                child: Text('Show Raw Email'),
               ),
             ],
+            onSelected: (value) {
+              if (value == 'headers' && body != null) {
+                _showHeaders(context, body);
+              } else if (value == 'structure' && body != null) {
+                _showStructure(context, body);
+              } else if (value == 'rfc') {
+                unawaited(_showRaw(context, header));
+              }
+            },
           ),
-          body: snap.connectionState == ConnectionState.waiting
-              ? const Center(child: CircularProgressIndicator())
-              : snap.hasError
-                  ? Center(child: Text('Error: ${snap.error}'))
-                  : _buildBody(ctx, header, body!),
-        );
-      },
+        ],
+      ),
+      body: detail.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (e, _) => Center(child: Text('Error: $e')),
+        data: (d) => _buildBody(context, d.$1, d.$2),
+      ),
     );
   }
 
@@ -186,9 +200,9 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
                 ),
               ),
             ),
-          _SafeHtml(
-            data: body.htmlBody!,
-            extensions: [if (!_loadRemoteImages) _BlockRemoteImagesExtension()],
+          SecureEmailWebView(
+            htmlBody: body.htmlBody!,
+            loadRemoteImages: _loadRemoteImages,
           ),
         ] else
           SelectableText(
@@ -277,26 +291,31 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
     );
   }
 
-  String _quotedBody(Email header, EmailBody? body) {
+  Future<String> _quotedBody(Email header, EmailBody? body) async {
     final date = header.sentAt != null ? _dateFmt.format(header.sentAt!) : '';
     final from =
         header.from.isNotEmpty ? header.from.first.toString() : '(unknown)';
-    final text = body?.textBody ?? htmlToPlain(body?.htmlBody ?? '');
+    final rawText = body?.textBody;
+    final text = (rawText != null && rawText.isNotEmpty)
+        ? rawText
+        : await compute(htmlToPlain, body?.htmlBody ?? '');
     final quoted = text.trim().split('\n').map((l) => '> $l').join('\n');
     return '\n\n— On $date, $from wrote:\n$quoted';
   }
 
-  void _reply(
+  Future<void> _reply(
     BuildContext context,
     Email header,
     EmailBody? body, {
     required bool replyAll,
-  }) {
+  }) async {
     final to = header.from.isNotEmpty ? header.from.first.email : '';
     final subject = (header.subject?.startsWith('Re:') ?? false)
         ? header.subject!
         : 'Re: ${header.subject ?? ''}';
     final cc = replyAll ? header.to.map((a) => a.email).join(', ') : '';
+    final quoted = await _quotedBody(header, body);
+    if (!context.mounted) return;
     unawaited(
       context.push(
         '/compose',
@@ -304,23 +323,29 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
           'replyToEmailId': widget.emailId,
           'prefillTo': to,
           'prefillSubject': subject,
-          'prefillBody': _quotedBody(header, body),
+          'prefillBody': quoted,
           if (cc.isNotEmpty) 'prefillCc': cc,
         },
       ),
     );
   }
 
-  void _forward(BuildContext context, Email header, EmailBody? body) {
+  Future<void> _forward(
+    BuildContext context,
+    Email header,
+    EmailBody? body,
+  ) async {
     final subject = (header.subject?.startsWith('Fwd:') ?? false)
         ? header.subject!
         : 'Fwd: ${header.subject ?? ''}';
+    final quoted = await _quotedBody(header, body);
+    if (!context.mounted) return;
     unawaited(
       context.push(
         '/compose',
         extra: {
           'prefillSubject': subject,
-          'prefillBody': _quotedBody(header, body),
+          'prefillBody': quoted,
         },
       ),
     );
@@ -400,6 +425,7 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
     if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
+          duration: const Duration(seconds: 5),
           content: Text(
             'Snoozed until ${DateFormat('MMM d, HH:mm').format(until)}',
           ),
@@ -409,10 +435,121 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
     }
   }
 
+  Future<void> _showRaw(BuildContext context, Email? header) async {
+    final String raw;
+    try {
+      raw = await ref
+          .read(emailRepositoryProvider)
+          .fetchRawRfc822(widget.emailId);
+    } catch (e) {
+      if (!context.mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('Failed to fetch raw email: $e')),
+      );
+      return;
+    }
+
+    if (!context.mounted) return;
+
+    unawaited(
+      showDialog<void>(
+        context: context,
+        builder: (ctx) => AlertDialog(
+          title: const Text('Raw Email'),
+          content: SizedBox(
+            width: double.maxFinite,
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  fmtSize(raw.length),
+                  style: Theme.of(ctx).textTheme.bodySmall?.copyWith(
+                        color: Theme.of(ctx).colorScheme.outline,
+                      ),
+                ),
+                const SizedBox(height: 4),
+                Flexible(
+                  child: SingleChildScrollView(
+                    child: SelectableText(
+                      raw,
+                      style: const TextStyle(
+                        fontFamily: 'monospace',
+                        fontSize: 12,
+                      ),
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+          actions: [
+            TextButton(
+              onPressed: () async {
+                await Clipboard.setData(ClipboardData(text: raw));
+                if (ctx.mounted) {
+                  ScaffoldMessenger.of(ctx).showSnackBar(
+                    const SnackBar(content: Text('Copied to clipboard')),
+                  );
+                }
+              },
+              child: const Text('Copy'),
+            ),
+            TextButton(
+              onPressed: () async {
+                await _downloadRaw(ctx, header, raw);
+                if (ctx.mounted) Navigator.pop(ctx);
+              },
+              child: const Text('Download'),
+            ),
+            TextButton(
+              onPressed: () => Navigator.pop(ctx),
+              child: const Text('Close'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Future<void> _downloadRaw(
+    BuildContext context,
+    Email? header,
+    String raw,
+  ) async {
+    try {
+      final dir = await getTemporaryDirectory();
+      final subject = (header?.subject ?? 'email')
+          .replaceAll(RegExp(r'[^\w\s-]'), '_')
+          .trim();
+      final filename = '$subject.eml';
+      final file = File('${dir.path}/$filename');
+      await file.writeAsString(raw);
+      if (!context.mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text('Saved $filename'),
+          action: SnackBarAction(
+            label: 'Share',
+            onPressed: () => SharePlus.instance.share(
+              ShareParams(files: [XFile(file.path)]),
+            ),
+          ),
+        ),
+      );
+    } catch (e) {
+      if (!context.mounted) return;
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text('Download failed: $e')));
+    }
+  }
+
   void _showHeaders(BuildContext context, EmailBody body) {
     if (body.headers.isEmpty) {
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(
+          duration: Duration(seconds: 5),
           content: Text('No headers available. Try re-syncing the email.'),
         ),
       );
@@ -466,6 +603,88 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
       ),
     );
   }
+
+  void _showStructure(BuildContext context, EmailBody body) {
+    final tree = body.mimeTree;
+    if (tree == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          duration: Duration(seconds: 5),
+          content: Text(
+            'Structure not available. Try re-syncing the email.',
+          ),
+        ),
+      );
+      return;
+    }
+
+    final rows = <_MimeRow>[];
+    _flattenMimeTree(tree, 0, rows);
+
+    unawaited(
+      showDialog<void>(
+        context: context,
+        builder: (ctx) => AlertDialog(
+          title: const Text('Mail Structure'),
+          content: SizedBox(
+            width: double.maxFinite,
+            child: ListView.builder(
+              shrinkWrap: true,
+              itemCount: rows.length,
+              itemBuilder: (ctx, i) {
+                final row = rows[i];
+                return Container(
+                  color: i.isEven
+                      ? Theme.of(ctx).colorScheme.surfaceContainerHighest
+                      : Theme.of(ctx).colorScheme.surface,
+                  padding: const EdgeInsets.symmetric(
+                    vertical: 4,
+                    horizontal: 8,
+                  ),
+                  child: Row(
+                    children: [
+                      SizedBox(width: row.depth * 16.0),
+                      Expanded(
+                        child: Text(
+                          row.label,
+                          style: Theme.of(ctx).textTheme.bodySmall?.copyWith(
+                                fontFamily: 'monospace',
+                              ),
+                        ),
+                      ),
+                    ],
+                  ),
+                );
+              },
+            ),
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(ctx),
+              child: const Text('Close'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _MimeRow {
+  const _MimeRow(this.depth, this.label);
+  final int depth;
+  final String label;
+}
+
+void _flattenMimeTree(MimePart part, int depth, List<_MimeRow> out) {
+  final parts = <String>[part.contentType];
+  if (part.filename != null) parts.add('"${part.filename}"');
+  if (part.size != null) parts.add(fmtSize(part.size!));
+  if (part.encoding != null) parts.add(part.encoding!);
+  out.add(_MimeRow(depth, parts.join('  ')));
+  for (final child in part.children) {
+    _flattenMimeTree(child, depth + 1, out);
+  }
 }
 
 /// Parses a List-Unsubscribe header and returns the first usable URI.
@@ -500,70 +719,3 @@ class _UnsubscribeChip extends StatelessWidget {
     );
   }
 }
-
-/// Renders [Html] and falls back to an error message if the widget throws
-/// during build, preventing a malformed body from crashing the whole screen.
-class _SafeHtml extends StatefulWidget {
-  const _SafeHtml({required this.data, required this.extensions});
-  final String data;
-  final List<HtmlExtension> extensions;
-
-  @override
-  State<_SafeHtml> createState() => _SafeHtmlState();
-}
-
-class _SafeHtmlState extends State<_SafeHtml> {
-  bool _failed = false;
-
-  @override
-  Widget build(BuildContext context) {
-    if (_failed) {
-      return Padding(
-        padding: const EdgeInsets.all(8),
-        child: Row(
-          children: [
-            Icon(
-              Icons.warning_amber_outlined,
-              color: Theme.of(context).colorScheme.error,
-              size: 16,
-            ),
-            const SizedBox(width: 8),
-            const Expanded(child: Text('Message body could not be rendered.')),
-          ],
-        ),
-      );
-    }
-
-    // Intercept any build-phase throw from flutter_html for this subtree.
-    // We save/restore via postFrameCallback so other widgets are unaffected.
-    final prev = ErrorWidget.builder;
-    ErrorWidget.builder = (FlutterErrorDetails details) {
-      ErrorWidget.builder = prev;
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        if (mounted) setState(() => _failed = true);
-      });
-      return const SizedBox.shrink();
-    };
-    WidgetsBinding.instance.addPostFrameCallback(
-      (_) => ErrorWidget.builder = prev,
-    );
-
-    return Html(data: widget.data, extensions: widget.extensions);
-  }
-}
-
-class _BlockRemoteImagesExtension extends HtmlExtension {
-  @override
-  Set<String> get supportedTags => {'img'};
-
-  @override
-  bool matches(ExtensionContext context) {
-    if (context.elementName != 'img') return false;
-    final src = context.attributes['src'] ?? '';
-    return src.startsWith('http://') || src.startsWith('https://');
-  }
-
-  @override
-  InlineSpan build(ExtensionContext context) =>
-      const WidgetSpan(child: SizedBox.shrink());
-}

lib/ui/screens/email_list_screen.dart

@@ -15,6 +15,14 @@ import 'package:sharedinbox/ui/widgets/folder_drawer.dart';
 import 'package:sharedinbox/ui/widgets/snooze_picker.dart';
 
 final _dateFmt = DateFormat('MMM d');
+// Cache formatted dates by local calendar day so DateFormat.format is called
+// at most once per unique date rather than once per list item per rebuild.
+final _formattedDates = <int, String>{};
+
+int _dayKey(DateTime dt) => dt.year * 10000 + dt.month * 100 + dt.day;
+
+String _fmtDate(DateTime dt) =>
+    _formattedDates[_dayKey(dt)] ??= _dateFmt.format(dt);
 
 class EmailListScreen extends ConsumerStatefulWidget {
   const EmailListScreen({
@@ -45,6 +53,10 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
   List<EmailThread> _currentThreads = [];
   // Individual email selection used in search results.
   final Set<String> _selectedSearchIds = {};
+
+  // Pagination: number of threads currently requested from the DB.
+  static const _pageSize = 50;
+  int _limit = _pageSize;
   bool get _selecting =>
       _selectedThreadIds.isNotEmpty || _selectedSearchIds.isNotEmpty;
 
@@ -82,6 +94,16 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
         _selectedSearchIds.clear();
       });
 
+  void _selectAll() {
+    setState(() {
+      if (_searching) {
+        _selectedSearchIds.addAll(_searchResults?.map((e) => e.id) ?? []);
+      } else {
+        _selectedThreadIds.addAll(_currentThreads.map((t) => t.threadId));
+      }
+    });
+  }
+
   void _toggleSearchSelection(String emailId) {
     setState(() {
       if (_selectedSearchIds.contains(emailId)) {
@@ -166,7 +188,13 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
           ? Text('$selectionCount selected')
           : Text(widget.mailboxPath),
       actions: _selecting
-          ? []
+          ? [
+              IconButton(
+                icon: const Icon(Icons.select_all),
+                tooltip: 'Select all',
+                onPressed: _selectAll,
+              ),
+            ]
           : [
               accountAsync.when(
                 loading: () => const SizedBox.shrink(),
@@ -189,6 +217,22 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
                   extra: {'accountId': widget.accountId},
                 ),
               ),
+              PopupMenuButton<String>(
+                onSelected: (value) async {
+                  if (value == 'mark_all_read') {
+                    await emailRepo.markAllAsRead(
+                      widget.accountId,
+                      widget.mailboxPath,
+                    );
+                  }
+                },
+                itemBuilder: (_) => const [
+                  PopupMenuItem(
+                    value: 'mark_all_read',
+                    child: Text('Mark all as read'),
+                  ),
+                ],
+              ),
             ],
       bottom: PreferredSize(
         preferredSize: const Size.fromHeight(60),
@@ -246,7 +290,10 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
               } catch (e) {
                 if (!mounted) return;
                 ScaffoldMessenger.of(context).showSnackBar(
-                  SnackBar(content: Text('Sync failed: $e')),
+                  SnackBar(
+                    duration: const Duration(seconds: 5),
+                    content: Text('Sync failed: $e'),
+                  ),
                 );
               }
             },
@@ -326,6 +373,12 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
           },
           child: const Text('Retry'),
         ),
+        TextButton(
+          onPressed: () => context.push(
+            '/accounts/${widget.accountId}/sync-log',
+          ),
+          child: const Text('View log'),
+        ),
         TextButton(
           onPressed: () => setState(() => _dismissedError = error),
           child: const Text('Dismiss'),
@@ -343,7 +396,11 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
         await emailRepo.syncEmails(widget.accountId, widget.mailboxPath);
       },
       child: StreamBuilder<List<EmailThread>>(
-        stream: emailRepo.observeThreads(widget.accountId, widget.mailboxPath),
+        stream: emailRepo.observeThreads(
+          widget.accountId,
+          widget.mailboxPath,
+          limit: _limit,
+        ),
         builder: (ctx, snap) {
           if (!snap.hasData) {
             return const Center(child: CircularProgressIndicator());
@@ -373,7 +430,12 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
     if (mailbox == null) {
       ScaffoldMessenger.of(
         context,
-      ).showSnackBar(SnackBar(content: Text(notFoundMessage)));
+      ).showSnackBar(
+        SnackBar(
+          duration: const Duration(seconds: 5),
+          content: Text(notFoundMessage),
+        ),
+      );
       return;
     }
     final repo = ref.read(emailRepositoryProvider);
@@ -404,8 +466,36 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
   Future<void> _batchArchive() =>
       _batchMoveToRole('archive', 'No archive folder found');
 
+  Future<void> _refreshSearchAndPopIfEmpty() async {
+    if (!mounted || !_searching) return;
+    final query = _searchController.text.trim();
+    final remaining = await ref
+        .read(emailRepositoryProvider)
+        .searchEmails(widget.accountId, widget.mailboxPath, query);
+    if (!mounted) return;
+    if (remaining.isEmpty) {
+      if (context.canPop()) {
+        context.pop();
+      } else {
+        _searchController.clear();
+      }
+    } else {
+      setState(() => _searchResults = remaining);
+    }
+  }
+
+  Future<void> _openSearchResultAndRefresh(String emailId) async {
+    await context.push(
+      '/accounts/${widget.accountId}/mailboxes'
+      '/${Uri.encodeComponent(widget.mailboxPath)}'
+      '/emails/${Uri.encodeComponent(emailId)}',
+    );
+    await _refreshSearchAndPopIfEmpty();
+  }
+
   Future<void> _batchDelete() async {
     final ids = _selectedEmailIds;
+    final wasSearching = _searching;
     _clearSelection();
     final repo = ref.read(emailRepositoryProvider);
 
@@ -432,6 +522,25 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
       originalEmails: originalEmails,
     );
     unawaited(ref.read(undoServiceProvider.notifier).pushAction(action));
+
+    if (wasSearching && mounted) {
+      // Filter deleted emails out of the local results immediately.
+      // Calling searchEmails here would hit the IMAP server, which still has
+      // the emails because the delete is only enqueued — not yet applied.
+      final deletedIds = ids.toSet();
+      final remaining = (_searchResults ?? [])
+          .where((e) => !deletedIds.contains(e.id))
+          .toList();
+      if (remaining.isEmpty) {
+        if (context.canPop()) {
+          context.pop();
+        } else {
+          _searchController.clear();
+        }
+      } else {
+        setState(() => _searchResults = remaining);
+      }
+    }
   }
 
   Future<void> _batchMarkSpam() =>
@@ -531,6 +640,7 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
 
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(
+        duration: const Duration(seconds: 5),
         content: Text(
           'Snoozed ${ids.length} email${ids.length == 1 ? '' : 's'} until ${DateFormat('MMM d, HH:mm').format(until)}',
         ),
@@ -539,9 +649,16 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
   }
 
   Widget _buildThreadList(List<EmailThread> threads) {
+    final hasMore = threads.length == _limit;
     return ListView.builder(
-      itemCount: threads.length,
+      itemCount: threads.length + (hasMore ? 1 : 0),
       itemBuilder: (ctx, i) {
+        if (i == threads.length) {
+          return TextButton(
+            onPressed: () => setState(() => _limit += _pageSize),
+            child: const Text('Load more'),
+          );
+        }
         final t = threads[i];
         final isSelected = _selectedThreadIds.contains(t.threadId);
         final senderNames =
@@ -610,7 +727,7 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
                 const Icon(Icons.star, color: Colors.amber, size: 16),
               const SizedBox(width: 4),
               Text(
-                _dateFmt.format(t.latestDate),
+                _fmtDate(t.latestDate),
                 style: Theme.of(ctx).textTheme.bodySmall,
               ),
             ],
@@ -726,9 +843,7 @@ class _EmailListScreenState extends ConsumerState<EmailListScreen> {
           ),
           onTap: _selecting
               ? () => _toggleSearchSelection(e.id)
-              : () => context.push(
-                    '/accounts/${widget.accountId}/mailboxes/${Uri.encodeComponent(widget.mailboxPath)}/emails/${Uri.encodeComponent(e.id)}',
-                  ),
+              : () => unawaited(_openSearchResultAndRefresh(e.id)),
           onLongPress: () => _toggleSearchSelection(e.id),
         );
       },

lib/ui/screens/search_screen.dart

@@ -10,6 +10,16 @@ import 'package:sharedinbox/core/utils/logger.dart';
 import 'package:sharedinbox/di.dart';
 import 'package:sharedinbox/ui/widgets/email_tile.dart';
 
+final _searchHistoryProvider =
+    FutureProvider.autoDispose<List<String>>((ref) async {
+  return ref.watch(searchHistoryRepositoryProvider).getRecentSearches();
+});
+
+/// Returns true if [text] contains a word that starts with [query].
+/// "foo" matches "foobar" or "My Foobar" but NOT "blafoo".
+bool _hasWordPrefix(String text, String query) =>
+    RegExp(r'\b' + RegExp.escape(query), caseSensitive: false).hasMatch(text);
+
 class SearchScreen extends ConsumerStatefulWidget {
   const SearchScreen({super.key, this.accountId});
   final String? accountId;
@@ -20,13 +30,24 @@ class SearchScreen extends ConsumerStatefulWidget {
 
 class _SearchScreenState extends ConsumerState<SearchScreen> {
   final _ctrl = TextEditingController();
+  final _focusNode = FocusNode();
   Timer? _debounce;
   _SearchResults? _results;
   bool _loading = false;
+  bool _fieldFocused = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _focusNode.addListener(() {
+      if (mounted) setState(() => _fieldFocused = _focusNode.hasFocus);
+    });
+  }
 
   @override
   void dispose() {
     _ctrl.dispose();
+    _focusNode.dispose();
     _debounce?.cancel();
     super.dispose();
   }
@@ -45,6 +66,12 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
 
   Future<void> _search(String query) async {
     setState(() => _loading = true);
+    unawaited(
+      ref
+          .read(searchHistoryRepositoryProvider)
+          .saveSearch(query)
+          .then((_) => ref.invalidate(_searchHistoryProvider)),
+    );
     try {
       final emailRepo = ref.read(emailRepositoryProvider);
       final mailboxRepo = ref.read(mailboxRepositoryProvider);
@@ -57,7 +84,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
       ).wait;
 
       final matchedMailboxes = allMailboxes
-          .where((m) => m.name.toLowerCase().contains(ql))
+          .where((m) => _hasWordPrefix(m.name, ql))
           .toList()
         ..sort(compareMailboxes);
 
@@ -69,8 +96,9 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
         for (final addr in [...email.from, ...email.to, ...email.cc]) {
           final key = '${email.accountId}:${addr.email}';
           if (seen.contains(key)) continue;
-          final matchesEmail = addr.email.toLowerCase().contains(ql);
-          final matchesName = addr.name?.toLowerCase().contains(ql) ?? false;
+          final matchesEmail = _hasWordPrefix(addr.email, ql);
+          final matchesName =
+              addr.name != null && _hasWordPrefix(addr.name!, ql);
           if (!matchesEmail && !matchesName) continue;
           seen.add(key);
           final addrEmail = addr.email;
@@ -112,6 +140,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
       appBar: AppBar(
         title: TextField(
           controller: _ctrl,
+          focusNode: _focusNode,
           autofocus: true,
           decoration: const InputDecoration(
             hintText: 'Search folders, addresses, emails…',
@@ -137,6 +166,9 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
   Widget _buildBody() {
     if (_loading) return const Center(child: CircularProgressIndicator());
     if (_results == null) {
+      if (_fieldFocused && _ctrl.text.isEmpty) {
+        return _buildHistoryPanel();
+      }
       return const Center(child: Text('Type 3+ characters to search'));
     }
     final r = _results!;
@@ -169,6 +201,66 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
       ],
     );
   }
+
+  Widget _buildHistoryPanel() {
+    final history = ref.watch(_searchHistoryProvider);
+    return history.when(
+      loading: () => const Center(child: Text('Type 3+ characters to search')),
+      error: (_, __) =>
+          const Center(child: Text('Type 3+ characters to search')),
+      data: (terms) {
+        if (terms.isEmpty) {
+          return const Center(child: Text('Type 3+ characters to search'));
+        }
+        return Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 16, 4),
+              child: Row(
+                mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                children: [
+                  Text(
+                    'Recent searches',
+                    style: Theme.of(context).textTheme.labelLarge,
+                  ),
+                  TextButton(
+                    onPressed: () async {
+                      await ref
+                          .read(searchHistoryRepositoryProvider)
+                          .clearHistory();
+                      ref.invalidate(_searchHistoryProvider);
+                    },
+                    child: const Text('Clear'),
+                  ),
+                ],
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 12),
+              child: Wrap(
+                spacing: 8,
+                runSpacing: 4,
+                children: [
+                  for (final term in terms)
+                    ActionChip(
+                      label: Text(term),
+                      onPressed: () {
+                        _ctrl.text = term;
+                        _ctrl.selection = TextSelection.fromPosition(
+                          TextPosition(offset: term.length),
+                        );
+                        unawaited(_search(term));
+                      },
+                    ),
+                ],
+              ),
+            ),
+          ],
+        );
+      },
+    );
+  }
 }
 
 class _SearchResults {

lib/ui/screens/sieve_script_edit_screen.dart

@@ -11,6 +11,7 @@ class SieveScriptEditScreen extends ConsumerStatefulWidget {
     super.key,
     required this.accountId,
     this.script,
+    this.isLocal = false,
   });
 
   final String accountId;
@@ -18,6 +19,9 @@ class SieveScriptEditScreen extends ConsumerStatefulWidget {
   /// Null when creating a new script.
   final SieveScript? script;
 
+  /// True for locally-executed scripts; false for server-side (ManageSieve/JMAP).
+  final bool isLocal;
+
   @override
   ConsumerState<SieveScriptEditScreen> createState() =>
       _SieveScriptEditScreenState();
@@ -50,9 +54,13 @@ class _SieveScriptEditScreenState extends ConsumerState<SieveScriptEditScreen> {
   Future<void> _loadContent() async {
     setState(() => _loadingContent = true);
     try {
-      final content = await ref
-          .read(sieveRepositoryProvider)
-          .getScriptContent(widget.accountId, widget.script!.blobId);
+      final content = widget.isLocal
+          ? await ref
+              .read(localSieveRepositoryProvider)
+              .getScriptContent(widget.accountId, widget.script!.blobId)
+          : await ref
+              .read(sieveRepositoryProvider)
+              .getScriptContent(widget.accountId, widget.script!.blobId);
       if (mounted) {
         _contentController.text = content;
         setState(() => _loadingContent = false);
@@ -78,12 +86,21 @@ class _SieveScriptEditScreenState extends ConsumerState<SieveScriptEditScreen> {
       _error = null;
     });
     try {
-      await ref.read(sieveRepositoryProvider).saveScript(
-            widget.accountId,
-            id: widget.script?.id,
-            name: name,
-            content: _contentController.text,
-          );
+      if (widget.isLocal) {
+        await ref.read(localSieveRepositoryProvider).saveScript(
+              widget.accountId,
+              id: widget.script?.id,
+              name: name,
+              content: _contentController.text,
+            );
+      } else {
+        await ref.read(sieveRepositoryProvider).saveScript(
+              widget.accountId,
+              id: widget.script?.id,
+              name: name,
+              content: _contentController.text,
+            );
+      }
       if (mounted) Navigator.of(context).pop();
     } catch (e) {
       if (mounted) {

lib/ui/screens/sieve_scripts_screen.dart

@@ -8,10 +8,17 @@ import 'package:sharedinbox/core/models/sieve_script.dart';
 import 'package:sharedinbox/di.dart';
 
 class SieveScriptsScreen extends ConsumerStatefulWidget {
-  const SieveScriptsScreen({super.key, required this.accountId});
+  const SieveScriptsScreen({
+    super.key,
+    required this.accountId,
+    this.isLocal = false,
+  });
 
   final String accountId;
 
+  /// True for locally-executed scripts; false for server-side (ManageSieve/JMAP).
+  final bool isLocal;
+
   @override
   ConsumerState<SieveScriptsScreen> createState() => _SieveScriptsScreenState();
 }
@@ -21,6 +28,10 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
   String? _error;
   bool _loading = true;
 
+  String get _editRoute => widget.isLocal
+      ? '/accounts/${widget.accountId}/sieve/local/edit'
+      : '/accounts/${widget.accountId}/sieve/edit';
+
   @override
   void initState() {
     super.initState();
@@ -33,8 +44,13 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
       _error = null;
     });
     try {
-      final scripts =
-          await ref.read(sieveRepositoryProvider).listScripts(widget.accountId);
+      final scripts = widget.isLocal
+          ? await ref
+              .read(localSieveRepositoryProvider)
+              .listScripts(widget.accountId)
+          : await ref
+              .read(sieveRepositoryProvider)
+              .listScripts(widget.accountId);
       if (mounted) {
         setState(() {
           _scripts = scripts;
@@ -53,15 +69,24 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
 
   Future<void> _activate(SieveScript script) async {
     try {
-      await ref
-          .read(sieveRepositoryProvider)
-          .activateScript(widget.accountId, script.id);
+      if (widget.isLocal) {
+        await ref
+            .read(localSieveRepositoryProvider)
+            .activateScript(widget.accountId, script.id);
+      } else {
+        await ref
+            .read(sieveRepositoryProvider)
+            .activateScript(widget.accountId, script.id);
+      }
       await _load();
     } catch (e) {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('Failed to activate: $e')));
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            duration: const Duration(seconds: 5),
+            content: Text('Failed to activate: $e'),
+          ),
+        );
       }
     }
   }
@@ -86,15 +111,24 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
     );
     if (!(confirmed ?? false) || !mounted) return;
     try {
-      await ref
-          .read(sieveRepositoryProvider)
-          .deleteScript(widget.accountId, script.id);
+      if (widget.isLocal) {
+        await ref
+            .read(localSieveRepositoryProvider)
+            .deleteScript(widget.accountId, script.id);
+      } else {
+        await ref
+            .read(sieveRepositoryProvider)
+            .deleteScript(widget.accountId, script.id);
+      }
       await _load();
     } catch (e) {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('Failed to delete: $e')));
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            duration: const Duration(seconds: 5),
+            content: Text('Failed to delete: $e'),
+          ),
+        );
       }
     }
   }
@@ -102,11 +136,15 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('Email filters')),
+      appBar: AppBar(
+        title: Text(
+          widget.isLocal ? 'Local Filters' : 'Remote Filters',
+        ),
+      ),
       body: _buildBody(),
       floatingActionButton: FloatingActionButton(
         onPressed: () async {
-          await context.push('/accounts/${widget.accountId}/sieve/edit');
+          await context.push(_editRoute);
           await _load();
         },
         child: const Icon(Icons.add),
@@ -134,22 +172,69 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
       );
     }
     final scripts = _scripts ?? [];
-    if (scripts.isEmpty) {
-      return const Center(
-        child: Text('No Sieve scripts. Tap + to create one.'),
-      );
-    }
-    return RefreshIndicator(
-      onRefresh: _load,
-      child: ListView.builder(
-        itemCount: scripts.length,
-        itemBuilder: (ctx, i) => _ScriptTile(
-          script: scripts[i],
-          accountId: widget.accountId,
-          onActivate: () => _activate(scripts[i]),
-          onDelete: () => _delete(scripts[i]),
-          onEdited: _load,
+    return Column(
+      children: [
+        _SieveSourceBanner(isLocal: widget.isLocal),
+        Expanded(
+          child: scripts.isEmpty
+              ? const Center(
+                  child: Text('No filters yet. Tap + to create one.'),
+                )
+              : RefreshIndicator(
+                  onRefresh: _load,
+                  child: ListView.builder(
+                    itemCount: scripts.length,
+                    itemBuilder: (ctx, i) => _ScriptTile(
+                      script: scripts[i],
+                      accountId: widget.accountId,
+                      editRoute: _editRoute,
+                      onActivate: () => _activate(scripts[i]),
+                      onDelete: () => _delete(scripts[i]),
+                      onEdited: _load,
+                    ),
+                  ),
+                ),
         ),
+      ],
+    );
+  }
+}
+
+class _SieveSourceBanner extends StatelessWidget {
+  const _SieveSourceBanner({required this.isLocal});
+
+  final bool isLocal;
+
+  @override
+  Widget build(BuildContext context) {
+    final text = isLocal
+        ? 'Local Filters run Sieve scripts directly on this device. '
+            'Remote Filters, which run on the mail server, are configured separately.'
+        : 'Remote Filters run Sieve scripts on the mail server '
+            '(ManageSieve or JMAP). '
+            'Local Filters, which run on this device, are configured separately.';
+    return Container(
+      width: double.infinity,
+      color: Theme.of(context).colorScheme.surfaceContainerHighest,
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Icon(
+            isLocal ? Icons.phone_android : Icons.dns,
+            size: 18,
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+          ),
+          const SizedBox(width: 8),
+          Expanded(
+            child: Text(
+              text,
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: Theme.of(context).colorScheme.onSurfaceVariant,
+                  ),
+            ),
+          ),
+        ],
       ),
     );
   }
@@ -159,6 +244,7 @@ class _ScriptTile extends StatelessWidget {
   const _ScriptTile({
     required this.script,
     required this.accountId,
+    required this.editRoute,
     required this.onActivate,
     required this.onDelete,
     required this.onEdited,
@@ -166,6 +252,7 @@ class _ScriptTile extends StatelessWidget {
 
   final SieveScript script;
   final String accountId;
+  final String editRoute;
   final VoidCallback onActivate;
   final VoidCallback onDelete;
   final VoidCallback onEdited;
@@ -183,10 +270,7 @@ class _ScriptTile extends StatelessWidget {
         onSelected: (action) async {
           switch (action) {
             case _ScriptAction.edit:
-              await context.push(
-                '/accounts/$accountId/sieve/edit',
-                extra: script,
-              );
+              await context.push(editRoute, extra: script);
               onEdited();
             case _ScriptAction.activate:
               onActivate();
@@ -209,7 +293,7 @@ class _ScriptTile extends StatelessWidget {
         ],
       ),
       onTap: () async {
-        await context.push('/accounts/$accountId/sieve/edit', extra: script);
+        await context.push(editRoute, extra: script);
         onEdited();
       },
     );

lib/ui/screens/sync_log_screen.dart

@@ -9,6 +9,11 @@ import 'package:sharedinbox/di.dart';
 
 final _timeFmt = DateFormat('MMM d, HH:mm:ss');
 
+String _fmtDuration(Duration d) {
+  final ms = d.inMilliseconds;
+  return ms < 1000 ? '${ms}ms' : '${(ms / 1000).toStringAsFixed(1)}s';
+}
+
 String _fmtBytes(int bytes) {
   if (bytes <= 0) return '0 B';
   if (bytes < 1024) return '$bytes B';
@@ -104,9 +109,7 @@ class _SyncLogTile extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final ms = entry.duration.inMilliseconds;
-    final durationLabel =
-        ms < 1000 ? '${ms}ms' : '${(ms / 1000).toStringAsFixed(1)}s';
+    final durationLabel = _fmtDuration(entry.duration);
     final proto =
         entry.protocol.isEmpty ? '' : ' · ${entry.protocol.toUpperCase()}';
     final theme = Theme.of(context);
@@ -154,7 +157,10 @@ class _SyncLogTile extends StatelessWidget {
                 for (final m in entry.mailboxStats)
                   _row(
                     '  ${m.mailboxPath}',
-                    '${m.fetched} new · ${m.skipped} up-to-date',
+                    [
+                      '${m.fetched} new · ${m.skipped} up-to-date',
+                      if (m.duration != null) _fmtDuration(m.duration!),
+                    ].join(' · '),
                   ),
               ],
               if (entry.errorMessage != null)

lib/ui/screens/thread_detail_screen.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
-import 'package:flutter_html/flutter_html.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
@@ -10,6 +9,7 @@ import 'package:sharedinbox/core/models/email.dart';
 import 'package:sharedinbox/core/models/undo_action.dart';
 import 'package:sharedinbox/core/utils/html_utils.dart';
 import 'package:sharedinbox/di.dart';
+import 'package:sharedinbox/ui/widgets/secure_email_webview.dart';
 
 final _dateFmt = DateFormat('EEE, MMM d, HH:mm');
 
@@ -163,11 +163,9 @@ class _EmailMessageCardState extends ConsumerState<_EmailMessageCard> {
                         onPressed: () =>
                             setState(() => _loadRemoteImages = true),
                       ),
-                    Html(
-                      data: body.htmlBody!,
-                      extensions: [
-                        if (!_loadRemoteImages) _BlockRemoteImagesExtension(),
-                      ],
+                    SecureEmailWebView(
+                      htmlBody: body.htmlBody!,
+                      loadRemoteImages: _loadRemoteImages,
                     ),
                   ] else
                     SelectableText(
@@ -248,6 +246,7 @@ class _EmailMessageCardState extends ConsumerState<_EmailMessageCard> {
         ],
       ),
     );
+    if (!mounted) return;
     if (confirmed == true) {
       final repo = ref.read(emailRepositoryProvider);
       // Fetch data first for IMAP undo support
@@ -255,6 +254,7 @@ class _EmailMessageCardState extends ConsumerState<_EmailMessageCard> {
 
       final destPath = await repo.deleteEmail(widget.email.id);
 
+      if (!mounted) return;
       if (original != null) {
         unawaited(
           ref.read(undoServiceProvider.notifier).pushAction(
@@ -273,19 +273,3 @@ class _EmailMessageCardState extends ConsumerState<_EmailMessageCard> {
     }
   }
 }
-
-class _BlockRemoteImagesExtension extends HtmlExtension {
-  @override
-  Set<String> get supportedTags => {'img'};
-
-  @override
-  bool matches(ExtensionContext context) {
-    if (context.elementName != 'img') return false;
-    final src = context.attributes['src'] ?? '';
-    return src.startsWith('http://') || src.startsWith('https://');
-  }
-
-  @override
-  InlineSpan build(ExtensionContext context) =>
-      const WidgetSpan(child: SizedBox.shrink());
-}

lib/ui/screens/undo_log_screen.dart

@@ -86,7 +86,12 @@ class _UndoActionTile extends ConsumerWidget {
           if (context.mounted) {
             ScaffoldMessenger.of(
               context,
-            ).showSnackBar(const SnackBar(content: Text('Action undone.')));
+            ).showSnackBar(
+              const SnackBar(
+                duration: Duration(seconds: 5),
+                content: Text('Action undone.'),
+              ),
+            );
           }
         },
         child: const Text('Undo'),

lib/ui/widgets/folder_drawer.dart

@@ -70,13 +70,21 @@ class FolderDrawer extends ConsumerWidget {
             },
           ),
           ListTile(
-            leading: const Icon(Icons.filter_list),
-            title: const Text('Email filters'),
+            leading: const Icon(Icons.dns),
+            title: const Text('Remote Filters'),
             onTap: () {
               Navigator.pop(context);
               unawaited(context.push('/accounts/$accountId/sieve'));
             },
           ),
+          ListTile(
+            leading: const Icon(Icons.phone_android),
+            title: const Text('Local Filters'),
+            onTap: () {
+              Navigator.pop(context);
+              unawaited(context.push('/accounts/$accountId/sieve/local'));
+            },
+          ),
           const Divider(height: 1),
           Expanded(
             child: StreamBuilder(

lib/ui/widgets/secure_email_webview.dart

@@ -0,0 +1,211 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:sharedinbox/core/utils/html_utils.dart';
+import 'package:url_launcher/url_launcher.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+/// Builds the full HTML document string for rendering an email body.
+///
+/// Forces `color-scheme: light` so that emails with black text remain readable
+/// when the device is in dark mode — the WebView would otherwise apply a dark
+/// background while leaving the email's own text colours unchanged.
+@visibleForTesting
+String buildEmailHtml(String htmlBody, {bool loadRemoteImages = false}) {
+  final imgSrc = loadRemoteImages ? 'https: http: data: blob:' : 'data: blob:';
+  // script-src 'none' blocks page scripts; JS mode stays unrestricted so the
+  // controller can call runJavaScriptReturningResult for height measurement.
+  const cspBase = "default-src 'none'; "
+      "style-src 'unsafe-inline'; "
+      "script-src 'none'; "
+      "object-src 'none'; "
+      "font-src 'none'";
+  final csp = '$cspBase; img-src $imgSrc';
+
+  return '''<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="color-scheme" content="light">
+<meta http-equiv="Content-Security-Policy" content="$csp">
+<style>
+body { margin: 0; padding: 0; font-family: sans-serif; word-break: break-word; color-scheme: light; background-color: #ffffff; color: #000000; }
+img { max-width: 100%; height: auto; }
+a { color: #1976D2; }
+* { box-sizing: border-box; }
+</style>
+</head>
+<body>
+$htmlBody
+</body>
+</html>''';
+}
+
+/// Renders an HTML email body securely.
+///
+/// On Android the content is displayed in a WebView with JavaScript blocked
+/// via CSP and remote images blocked until the user opts in.  Link taps show
+/// a confirmation dialog that highlights the registered domain to aid phishing
+/// detection.
+///
+/// On Linux (where webview_flutter has no platform support) the HTML is
+/// converted to plain text and shown in a [SelectableText] widget.
+class SecureEmailWebView extends StatefulWidget {
+  const SecureEmailWebView({
+    super.key,
+    required this.htmlBody,
+    this.loadRemoteImages = false,
+  });
+
+  final String htmlBody;
+  final bool loadRemoteImages;
+
+  @override
+  State<SecureEmailWebView> createState() => _SecureEmailWebViewState();
+}
+
+class _SecureEmailWebViewState extends State<SecureEmailWebView> {
+  // Null on Linux where WebView is unavailable.
+  WebViewController? _controller;
+  double _height = 300;
+
+  @override
+  void initState() {
+    super.initState();
+    if (!Platform.isLinux) {
+      final c = WebViewController();
+      unawaited(c.setJavaScriptMode(JavaScriptMode.unrestricted));
+      unawaited(c.setBackgroundColor(Colors.transparent));
+      unawaited(
+        c.setNavigationDelegate(
+          NavigationDelegate(
+            onNavigationRequest: _handleNavigation,
+            onPageFinished: _measureHeight,
+          ),
+        ),
+      );
+      unawaited(c.loadHtmlString(_buildHtml()));
+      _controller = c;
+    }
+  }
+
+  @override
+  void didUpdateWidget(SecureEmailWebView old) {
+    super.didUpdateWidget(old);
+    if (old.htmlBody != widget.htmlBody ||
+        old.loadRemoteImages != widget.loadRemoteImages) {
+      if (_controller != null) {
+        unawaited(_controller!.loadHtmlString(_buildHtml()));
+      }
+    }
+  }
+
+  String _buildHtml() => buildEmailHtml(
+        widget.htmlBody,
+        loadRemoteImages: widget.loadRemoteImages,
+      );
+
+  Future<void> _measureHeight(String _) async {
+    final result = await _controller!.runJavaScriptReturningResult(
+      'document.documentElement.scrollHeight',
+    );
+    final h = double.tryParse(result.toString());
+    if (h != null && h > 0 && mounted) {
+      setState(() => _height = h);
+    }
+  }
+
+  NavigationDecision _handleNavigation(NavigationRequest req) {
+    final url = req.url;
+    if (url == 'about:blank' || url.startsWith('data:')) {
+      return NavigationDecision.navigate;
+    }
+    unawaited(_showLinkDialog(url));
+    return NavigationDecision.prevent;
+  }
+
+  Future<void> _showLinkDialog(String url) async {
+    final uri = Uri.tryParse(url);
+    if (uri == null || !mounted) return;
+
+    final host = uri.host;
+    final parts = host.split('.');
+    // Bold the registered domain (last two DNS labels) to aid phishing detection.
+    final boldStart = (parts.length >= 2
+            ? host.length -
+                parts.last.length -
+                1 -
+                parts[parts.length - 2].length
+            : 0)
+        .clamp(0, host.length);
+
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('Open link?'),
+        content: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text.rich(
+              TextSpan(
+                style: const TextStyle(fontFamily: 'monospace', fontSize: 13),
+                children: [
+                  TextSpan(text: host.substring(0, boldStart)),
+                  TextSpan(
+                    text: host.substring(boldStart),
+                    style: const TextStyle(fontWeight: FontWeight.bold),
+                  ),
+                ],
+              ),
+            ),
+            const SizedBox(height: 4),
+            Text(
+              url,
+              style: const TextStyle(fontSize: 11, color: Colors.grey),
+              maxLines: 3,
+              overflow: TextOverflow.ellipsis,
+            ),
+          ],
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(ctx, false),
+            child: const Text('Cancel'),
+          ),
+          TextButton(
+            onPressed: () => Navigator.pop(ctx, true),
+            child: const Text('Open in browser'),
+          ),
+        ],
+      ),
+    );
+
+    if (confirmed == true && mounted) {
+      final launched =
+          await launchUrl(uri, mode: LaunchMode.externalApplication);
+      if (!launched && mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('Could not open: $url')),
+        );
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // Linux has no webview_flutter platform implementation — show plain text.
+    if (Platform.isLinux) {
+      return SelectableText(
+        htmlToPlain(widget.htmlBody),
+        style: Theme.of(context).textTheme.bodyMedium,
+      );
+    }
+    return SizedBox(
+      height: _height,
+      child: WebViewWidget(controller: _controller!),
+    );
+  }
+}

lib/ui/widgets/undo_shell.dart

@@ -13,7 +13,12 @@ class UndoShell extends ConsumerWidget {
     ref.listen<List<UndoAction>>(undoServiceProvider, (previous, next) {
       if (next.isNotEmpty &&
           (previous == null || previous.length < next.length)) {
-        _showUndoSnackbar(context, ref, next.last);
+        final action = next.last;
+        // Don't show a snackbar for actions loaded from persistence on app
+        // startup — only for actions pushed in this session.
+        if (DateTime.now().difference(action.timestamp).inSeconds < 30) {
+          _showUndoSnackbar(context, ref, action);
+        }
       }
     });
 
@@ -29,6 +34,7 @@ class UndoShell extends ConsumerWidget {
     scaffoldMessenger.clearSnackBars();
     scaffoldMessenger.showSnackBar(
       SnackBar(
+        duration: const Duration(seconds: 5),
         content: Text(
           action.type == UndoType.delete
               ? '${action.emailIds.length} email(s) moved to Trash'

pubspec.yaml

@@ -40,14 +40,27 @@ dependencies:
   open_filex: ^4.6.0
   mime: ^2.0.0
 
+  # QR code generation for account sharing
+  qr_flutter: ^4.1.0
+
+  # Public-key encryption for secure account sharing (ECIES: X25519 + AES-256-GCM)
+  cryptography: ^2.7.0
+
+  # QR code scanning (camera) for secure account import
+  mobile_scanner: ^5.0.0
+
   # HTML rendering for email bodies
-  flutter_html: ^3.0.0
+  webview_flutter: ^4.0.0
   url_launcher: ^6.3.2
   flutter_markdown: ^0.7.7+1
 
   # Background sync and local notifications
   flutter_local_notifications: ^18.0.1
-  workmanager: ^0.5.2
+  workmanager: ^0.9.0
+
+  # App version metadata for crash reports
+  package_info_plus: ^8.0.0
+  share_plus: ^12.0.2
 
 dev_dependencies:
   flutter_test:
@@ -60,6 +73,7 @@ dev_dependencies:
   test: ^1.25.0
   mockito: ^5.4.4
   fake_async: ^1.3.1
+  path_provider_platform_interface: ^2.1.2
   sqlite3: any  # used directly in test/unit/db_test_helper.dart
   url_launcher_platform_interface: ^2.3.2
   plugin_platform_interface: ^2.1.8

scripts/agent_loop.py

@@ -0,0 +1,326 @@
+#!/usr/bin/env python3
+"""
+agent_loop.py — called from cron every 10 minutes.
+
+Flow
+----
+1. Agent already running?
+   a. Age > 1 h  → kill it, set its issue to State/Question, exit 1
+   b. Age ≤ 1 h  → print status, exit 0  (let it keep working)
+2. No agent running → check Codeberg CI
+   a. CI is running         → print "CI running, waiting", exit 0
+   b. Latest CI failed      → start fix-CI agent, save state, exit 0
+   c. CI ok (or no run yet) → find oldest Ready issue, start issue agent,
+                              save state, exit 0
+   d. No Ready issues       → print "nothing to do", exit 0
+
+State file: ~/.sharedinbox-agent-state.json
+  { "pid": 12345, "issue": 91,
+    "started_at": "2026-05-15T12:00:00+00:00", "type": "issue" }
+
+Output is written to ~/.sharedinbox-agent-logs/<session>-<timestamp>.log.
+Resume the Claude conversation afterward with:
+
+  claude --resume issue-91
+"""
+
+import json
+import os
+import shlex
+import subprocess
+import sys
+from datetime import datetime, timezone
+from pathlib import Path
+
+# Cron runs with a minimal PATH; ensure Nix profile binaries (tea, claude) are found.
+os.environ["PATH"] = f"/home/si/.nix-profile/bin:{os.environ.get('PATH', '/usr/bin:/bin')}"
+
+# ── configuration ─────────────────────────────────────────────────────────────
+
+REPO = "guettli/sharedinbox"
+STATE_FILE = Path.home() / ".sharedinbox-agent-state.json"
+MAX_AGENT_AGE_SECONDS = 3600  # 1 hour
+
+# Labels used by the workflow.
+LABEL_READY = "State/Ready"
+LABEL_IN_PROGRESS = "State/InProgress"
+LABEL_QUESTION = "State/Question"
+
+# ── helpers ───────────────────────────────────────────────────────────────────
+
+
+def _tea(*args: str) -> dict | list | None:
+    """Run a `tea api` command and return parsed JSON, or None on 204."""
+    method = "GET"
+    path = args[0]
+    extra: list[str] = []
+    body_str = None
+
+    i = 1
+    while i < len(args):
+        if args[i] in ("--method", "-X") and i + 1 < len(args):
+            method = args[i + 1]
+            i += 2
+        elif args[i] in ("--data", "-d") and i + 1 < len(args):
+            body_str = args[i + 1]
+            i += 2
+        else:
+            extra.append(args[i])
+            i += 1
+
+    cmd = ["tea", "api", "--repo", REPO, "-X", method]
+    if body_str:
+        cmd += ["-d", body_str]
+    cmd.append(path)
+
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    if result.returncode != 0:
+        raise RuntimeError(
+            f"tea api {path} failed:\n{result.stderr or result.stdout}"
+        )
+    out = result.stdout.strip()
+    if not out:
+        return None
+    return json.loads(out)
+
+
+def _set_labels(issue: int, add: list[str], remove: list[str]) -> None:
+    """Replace labels on an issue via the tea CLI."""
+    current = _tea(f"repos/{REPO}/issues/{issue}/labels") or []
+    current_names = {lbl["name"] for lbl in current}
+    all_labels = _tea(f"repos/{REPO}/labels") or []
+    name_to_id = {lbl["name"]: lbl["id"] for lbl in all_labels}
+
+    desired = (current_names - set(remove)) | set(add)
+    ids = [name_to_id[n] for n in desired if n in name_to_id]
+    _tea(
+        f"repos/{REPO}/issues/{issue}/labels",
+        "-X", "PUT",
+        "-d", json.dumps({"labels": ids}),
+    )
+
+
+def _close_issue(issue: int) -> None:
+    _tea(
+        f"repos/{REPO}/issues/{issue}",
+        "-X", "PATCH",
+        "-d", json.dumps({"state": "closed"}),
+    )
+
+
+def _ready_issues() -> list[dict]:
+    """Return open issues with State/Ready, oldest first."""
+    data = _tea(f"repos/{REPO}/issues?state=open&type=issues&limit=50") or []
+    ready = [
+        i for i in data
+        if any(lbl["name"] == LABEL_READY for lbl in i.get("labels", []))
+    ]
+    ready.sort(key=lambda i: i["number"])
+    return ready
+
+
+def _latest_ci_run() -> dict | None:
+    data = _tea(f"repos/{REPO}/actions/runs?limit=1")
+    runs = (data or {}).get("workflow_runs", [])
+    return runs[0] if runs else None
+
+
+# ── state file ────────────────────────────────────────────────────────────────
+
+
+def _read_state() -> dict | None:
+    if STATE_FILE.exists():
+        try:
+            return json.loads(STATE_FILE.read_text())
+        except Exception:
+            pass
+    return None
+
+
+def _write_state(pid: int, issue: int | None, kind: str) -> None:
+    STATE_FILE.write_text(
+        json.dumps(
+            {
+                "pid": pid,
+                "issue": issue,
+                "started_at": datetime.now(timezone.utc).isoformat(),
+                "type": kind,
+            },
+            indent=2,
+        )
+    )
+
+
+def _clear_state() -> None:
+    STATE_FILE.unlink(missing_ok=True)
+
+
+# ── agent launcher ────────────────────────────────────────────────────────────
+
+
+def _start_agent(prompt: str, session_name: str) -> int:
+    """Start Claude Code as a detached background process and return its PID."""
+    log_dir = Path.home() / ".sharedinbox-agent-logs"
+    log_dir.mkdir(exist_ok=True)
+    ts = datetime.now().strftime("%Y%m%dT%H%M%S")
+    log_file = log_dir / f"{session_name}-{ts}.log"
+
+    log_fh = open(log_file, "w")
+    proc = subprocess.Popen(
+        [
+            "claude",
+            "--dangerously-skip-permissions",
+            "--name", session_name,
+            "-p", prompt,
+        ],
+        stdin=subprocess.PIPE,
+        stdout=log_fh,
+        stderr=log_fh,
+        start_new_session=True,
+    )
+    log_fh.close()  # Parent closes its copy; the child retains the fd.
+    # Answer the workspace-trust dialog; after this the pipe hits EOF.
+    proc.stdin.write(b"\n")
+    proc.stdin.close()
+
+    print(f"[agent_loop] Started agent pid={proc.pid}, log={log_file}")
+    print(f"[agent_loop]   Resume: claude --resume {shlex.quote(session_name)}")
+    return proc.pid
+
+
+def _agent_alive(state: dict) -> bool:
+    """Return True if the agent process is still running."""
+    pid = state.get("pid")
+    if pid is None:
+        return False
+    try:
+        os.kill(pid, 0)
+        return True
+    except ProcessLookupError:
+        return False
+    except PermissionError:
+        return True
+
+
+def _agent_age_seconds(state: dict) -> float:
+    """Seconds elapsed since the agent was launched, from the state file timestamp."""
+    try:
+        started_at = datetime.fromisoformat(state["started_at"])
+        return (datetime.now(timezone.utc) - started_at).total_seconds()
+    except Exception:
+        return 0.0
+
+
+def _kill_agent(state: dict) -> None:
+    """Forcefully stop the running agent."""
+    pid = state.get("pid")
+    if pid:
+        try:
+            os.kill(pid, 9)
+        except ProcessLookupError:
+            pass
+
+
+# ── main flow ─────────────────────────────────────────────────────────────────
+
+
+def main() -> int:
+    state = _read_state()
+
+    # ── 1. Agent already running? ─────────────────────────────────────────────
+    if state and _agent_alive(state):
+        age = _agent_age_seconds(state)
+        issue = state.get("issue")
+        kind = state.get("type", "issue")
+        pid = state.get("pid", "?")
+
+        if age > MAX_AGENT_AGE_SECONDS:
+            print(
+                f"[agent_loop] Agent pid={pid!r} (issue #{issue}) "
+                f"has been running for {age/60:.0f} min — aborting."
+            )
+            _kill_agent(state)
+            _clear_state()
+            if issue:
+                _set_labels(issue, add=[LABEL_QUESTION], remove=[LABEL_IN_PROGRESS])
+                print(f"[agent_loop] Set issue #{issue} to State/Question.")
+            return 1
+
+        print(
+            f"[agent_loop] Agent pid={pid!r} ({kind}, issue #{issue}) "
+            f"still running ({age/60:.0f} min). Waiting."
+        )
+        return 0
+
+    # Agent not running (or no state) — clean up stale state.
+    if state:
+        _clear_state()
+
+    # ── 2. Check CI ───────────────────────────────────────────────────────────
+    run = _latest_ci_run()
+
+    if run and run.get("status") == "running":
+        print(f"[agent_loop] CI run {run['id']} is still running. Waiting.")
+        return 0
+
+    if run and run.get("status") in ("failure", "error"):
+        print(f"[agent_loop] CI run {run['id']} failed — starting fix agent.")
+        prompt = (
+            "The Codeberg CI for guettli/sharedinbox just failed. "
+            f"The CI run ID is {run['id']}. "
+            "Fetch the CI logs using the task ci-logs command or the Codeberg API. "
+            "Identify the failure, fix it, commit, and push. "
+            "Verify locally with 'task check' before pushing. "
+            "When done, stop."
+        )
+        pid = _start_agent(prompt, "ci-fix")
+        _write_state(pid, None, "ci-fix")
+        return 0
+
+    # CI is ok (or no run) — find a Ready issue.
+    issues = _ready_issues()
+    if not issues:
+        print("[agent_loop] No issues with State/Ready. Nothing to do.")
+        return 0
+
+    issue = issues[0]
+    issue_number = issue["number"]
+    issue_title = issue["title"]
+    issue_body = issue.get("body", "")
+
+    print(f"[agent_loop] Starting agent for issue #{issue_number}: {issue_title}")
+
+    # Mark InProgress before starting so the next cron tick sees it even if
+    # the agent hasn't had time to do so yet.
+    _set_labels(
+        issue_number,
+        add=[LABEL_IN_PROGRESS],
+        remove=[LABEL_READY],
+    )
+
+    prompt = f"""Work on Codeberg issue #{issue_number} in the guettli/sharedinbox repository.
+
+Issue title: {issue_title}
+
+Issue body:
+{issue_body}
+
+Instructions:
+- Understand the issue thoroughly before writing any code.
+- Implement the required change, following the existing code style.
+- Write or update tests as appropriate.
+- Run 'task check' locally and fix any failures before committing.
+- Commit with a descriptive message referencing the issue number (e.g. "feat: ... (#{issue_number})").
+- Push to origin/main.
+- If you hit a blocker you cannot resolve, set the issue label to State/Question
+  and stop (do NOT close the issue).
+- When the work is done and pushed, close the issue and stop.
+"""
+
+    pid = _start_agent(prompt, f"issue-{issue_number}")
+    _write_state(pid, issue_number, "issue")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

scripts/check_coverage.dart

@@ -15,8 +15,10 @@ const _noCode = {
   'lib/core/repositories/draft_repository.dart',
   'lib/core/repositories/email_repository.dart',
   'lib/core/repositories/mailbox_repository.dart',
+  'lib/core/repositories/share_key_repository.dart',
   'lib/core/repositories/sync_log_repository.dart',
   'lib/core/repositories/undo_repository.dart',
+  'lib/core/repositories/search_history_repository.dart',
   'lib/core/models/undo_action.dart',
   'lib/core/storage/secure_storage.dart',
 };
@@ -32,6 +34,8 @@ const _excluded = {
   'lib/main.dart',
   'lib/ui/router.dart',
   'lib/ui/screens/account_list_screen.dart',
+  'lib/ui/screens/account_receive_screen.dart',
+  'lib/ui/screens/account_send_screen.dart',
   'lib/ui/screens/add_account_screen.dart',
   'lib/ui/screens/address_emails_screen.dart',
   'lib/ui/screens/changelog_screen.dart',
@@ -48,9 +52,12 @@ const _excluded = {
   'lib/ui/screens/thread_detail_screen.dart',
   'lib/ui/screens/undo_log_screen.dart',
   'lib/ui/widgets/folder_drawer.dart',
+  'lib/ui/widgets/secure_email_webview.dart',
   'lib/ui/widgets/snooze_picker.dart',
   'lib/ui/widgets/try_connection_button.dart',
   'lib/ui/widgets/undo_shell.dart',
+  'lib/ui/screens/about_screen.dart',
+  'lib/ui/widgets/email_tile.dart',
   'lib/core/sync/account_sync_manager.dart',
   'lib/core/sync/background_sync.dart',
   'lib/core/sync/reliability_runner.dart',
@@ -59,8 +66,11 @@ const _excluded = {
   'lib/data/repositories/account_repository_impl.dart',
   'lib/data/repositories/email_repository_impl.dart',
   'lib/data/repositories/mailbox_repository_impl.dart',
+  'lib/data/repositories/share_key_repository_impl.dart',
   'lib/data/repositories/sync_log_repository_impl.dart',
   'lib/data/repositories/undo_repository_impl.dart',
+  'lib/data/repositories/search_history_repository_impl.dart',
+  'lib/core/services/update_service.dart',
 };
 
 void main() {

scripts/check_mocks_fresh.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Verify that all *.mocks.dart files are up to date.
+# Re-runs build_runner and fails if any generated mock differs from what is committed.
+set -euo pipefail
+cd "$(git rev-parse --show-toplevel)"
+
+echo "check-mocks: regenerating..."
+fvm flutter pub run build_runner build --delete-conflicting-outputs 2>&1
+
+CHANGED=$(git diff --name-only -- '*.mocks.dart')
+if [ -n "$CHANGED" ]; then
+    echo "ERROR: The following mock files are out of date:"
+    echo "$CHANGED"
+    echo "Run 'task codegen' and commit the regenerated mocks."
+    exit 1
+fi
+echo "check-mocks: all mock files are up to date."

scripts/check_no_binary.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Fail if binary files (other than images and fonts) are staged for commit.
+# Prevents accidental inclusion of build artifacts, databases, compiled binaries.
+set -euo pipefail
+
+ALLOWED_EXTENSIONS='(png|jpg|jpeg|gif|webp|svg|ico|ttf|otf|woff|woff2)'
+
+# git diff --numstat shows "-  -  path" for binary files
+BINARY=$(git diff --cached --numstat | awk '$1=="-" && $2=="-" {print $3}')
+
+if [ -z "$BINARY" ]; then
+  exit 0
+fi
+
+BLOCKED=''
+while IFS= read -r f; do
+  if ! echo "$f" | grep -qiE "\.$ALLOWED_EXTENSIONS$"; then
+    BLOCKED="$BLOCKED\n  $f"
+  fi
+done <<< "$BINARY"
+
+if [ -n "$BLOCKED" ]; then
+  echo "Binary files staged for commit (not allowed):"
+  echo -e "$BLOCKED"
+  echo ""
+  echo "If this is intentional, add the extension to ALLOWED_EXTENSIONS in scripts/check_no_binary.sh"
+  exit 1
+fi

scripts/deploy_playstore.py

@@ -4,14 +4,73 @@
 import json
 import os
 import sys
+import time
 
+import requests
+from google.auth.transport.requests import AuthorizedSession
 from google.oauth2 import service_account
-from googleapiclient.discovery import build
-from googleapiclient.http import MediaFileUpload
 
 PACKAGE_NAME = "de.sharedinbox.mua"
 AAB_PATH = "build/app/outputs/bundle/release/app-release.aab"
 TRACK = "internal"
+_TIMEOUT = 300  # seconds — AAB uploads can be large
+_MAX_UPLOAD_ATTEMPTS = 3
+_BASE = "https://androidpublisher.googleapis.com/androidpublisher/v3/applications"
+_UPLOAD_BASE = "https://androidpublisher.googleapis.com/upload/androidpublisher/v3/applications"
+
+
+def _make_session(config_json: str) -> AuthorizedSession:
+    creds = service_account.Credentials.from_service_account_info(
+        json.loads(config_json),
+        scopes=["https://www.googleapis.com/auth/androidpublisher"],
+    )
+    return AuthorizedSession(creds)
+
+
+def _upload_aab(session: AuthorizedSession, edit_id: str) -> int:
+    """Resumable upload of the AAB. Returns the version code."""
+    file_size = os.path.getsize(AAB_PATH)
+
+    init_resp = session.post(
+        f"{_UPLOAD_BASE}/{PACKAGE_NAME}/edits/{edit_id}/bundles",
+        params={"uploadType": "resumable"},
+        headers={
+            "X-Upload-Content-Type": "application/octet-stream",
+            "X-Upload-Content-Length": str(file_size),
+        },
+        json={},
+        timeout=30,
+    )
+    init_resp.raise_for_status()
+    upload_url = init_resp.headers["Location"]
+
+    with open(AAB_PATH, "rb") as f:
+        data = f.read()
+
+    last_exc = None
+    for attempt in range(_MAX_UPLOAD_ATTEMPTS):
+        try:
+            upload_resp = session.put(
+                upload_url,
+                data=data,
+                headers={
+                    "Content-Type": "application/octet-stream",
+                    "Content-Length": str(file_size),
+                },
+                timeout=_TIMEOUT,
+            )
+            upload_resp.raise_for_status()
+            return upload_resp.json()["versionCode"]
+        except requests.HTTPError as exc:
+            last_exc = exc
+            if attempt < _MAX_UPLOAD_ATTEMPTS - 1:
+                delay = 10 * (2 ** attempt)
+                print(f"Upload attempt {attempt + 1} failed ({exc}), retrying in {delay}s…")
+                time.sleep(delay)
+
+    raise RuntimeError(
+        f"AAB upload failed after {_MAX_UPLOAD_ATTEMPTS} attempts"
+    ) from last_exc
 
 
 def main():
@@ -24,34 +83,31 @@ def main():
         print(f"Error: AAB not found at {AAB_PATH}", file=sys.stderr)
         sys.exit(1)
 
-    creds = service_account.Credentials.from_service_account_info(
-        json.loads(config_json),
-        scopes=["https://www.googleapis.com/auth/androidpublisher"],
+    session = _make_session(config_json)
+
+    edit_resp = session.post(
+        f"{_BASE}/{PACKAGE_NAME}/edits",
+        json={},
+        timeout=30,
     )
+    edit_resp.raise_for_status()
+    edit_id = edit_resp.json()["id"]
 
-    service = build("androidpublisher", "v3", credentials=creds)
-
-    edit = service.edits().insert(body={}, packageName=PACKAGE_NAME).execute()
-    edit_id = edit["id"]
-
-    media = MediaFileUpload(AAB_PATH, mimetype="application/octet-stream", resumable=True)
-    bundle = (
-        service.edits()
-        .bundles()
-        .upload(packageName=PACKAGE_NAME, editId=edit_id, media_body=media)
-        .execute()
-    )
-    version_code = bundle["versionCode"]
+    version_code = _upload_aab(session, edit_id)
     print(f"Uploaded AAB, version code: {version_code}")
 
-    service.edits().tracks().update(
-        packageName=PACKAGE_NAME,
-        editId=edit_id,
-        track=TRACK,
-        body={"releases": [{"versionCodes": [version_code], "status": "completed"}]},
-    ).execute()
+    tracks_resp = session.put(
+        f"{_BASE}/{PACKAGE_NAME}/edits/{edit_id}/tracks/{TRACK}",
+        json={"releases": [{"versionCodes": [version_code], "status": "completed"}]},
+        timeout=30,
+    )
+    tracks_resp.raise_for_status()
 
-    service.edits().commit(packageName=PACKAGE_NAME, editId=edit_id).execute()
+    commit_resp = session.post(
+        f"{_BASE}/{PACKAGE_NAME}/edits/{edit_id}:commit",
+        timeout=30,
+    )
+    commit_resp.raise_for_status()
     print(f"Deployed version {version_code} to {TRACK} track")
 
 

scripts/generate_build_history.py

@@ -0,0 +1,176 @@
+#!/usr/bin/env python3
+"""Generate Hugo markdown pages listing builds fetched from the server.
+
+Reads build artifacts under public_html/builds/ on the deployment server via SSH,
+parses the git hash from each filename, fetches the commit title from the
+Codeberg API, then writes Hugo content pages to website/content/builds/.
+
+Covers two platforms:
+  - Linux:   sharedinbox-linux-amd64-<hash>.tar.gz
+  - Android: sharedinbox-mua-<hash>.apk
+
+At most MAX_BUILDS_PER_PLATFORM of the most-recent builds are shown per platform.
+
+These generated pages are not tracked in git (see .gitignore).
+"""
+import json
+import os
+import re
+import subprocess
+import sys
+import urllib.request
+from pathlib import Path
+
+CODEBERG_REPO = "guettli/sharedinbox"
+REMOTE_BUILDS_DIR = "public_html/builds"
+CONTENT_DIR = Path("website/content/builds")
+BASE_URL = "https://sharedinbox.de"
+CODEBERG_BASE = "https://codeberg.org"
+MAX_BUILDS_PER_PLATFORM = 30
+
+
+def list_remote_files(ssh_user: str, ssh_host: str, pattern: str) -> list[str]:
+    result = subprocess.run(
+        [
+            "ssh",
+            "-o",
+            "StrictHostKeyChecking=no",
+            f"{ssh_user}@{ssh_host}",
+            f"find {REMOTE_BUILDS_DIR} -name '{pattern}' -type f | sort",
+        ],
+        capture_output=True,
+        text=True,
+        check=True,
+    )
+    return [line.strip() for line in result.stdout.splitlines() if line.strip()]
+
+
+def get_commit_info(hash_val: str) -> tuple[str, str]:
+    """Return (title, datetime_iso) for the given commit hash."""
+    url = f"https://codeberg.org/api/v1/repos/{CODEBERG_REPO}/git/commits/{hash_val}"
+    try:
+        req = urllib.request.Request(url, headers={"User-Agent": "sharedinbox-ci"})
+        with urllib.request.urlopen(req, timeout=10) as resp:
+            data = json.loads(resp.read())
+        title = data.get("commit", {}).get("message", "").split("\n")[0]
+        dt = data.get("commit", {}).get("committer", {}).get("date", "")
+        return title, dt
+    except Exception as exc:
+        print(f"  warning: could not fetch commit info for {hash_val}: {exc}", file=sys.stderr)
+        return hash_val, ""
+
+
+def parse_builds(
+    paths: list[str],
+    path_re: re.Pattern,  # type: ignore[type-arg]
+) -> dict[str, list[tuple[str, str, str, str]]]:
+    """Parse build file paths into {date_key: [(hash, url, title, dt), ...]}."""
+    limited = paths[-MAX_BUILDS_PER_PLATFORM:] if len(paths) > MAX_BUILDS_PER_PLATFORM else paths
+    days: dict[str, list[tuple[str, str, str, str]]] = {}
+    for path in limited:
+        m = path_re.match(path)
+        if not m:
+            print(f"  skipping unexpected path: {path}", file=sys.stderr)
+            continue
+        year, month, day, filename, hash_val = m.groups()
+        date_key = f"{year}/{month}/{day}"
+        download_url = f"{BASE_URL}/builds/{year}/{month}/{day}/{filename}"
+        commit_title, commit_dt = get_commit_info(hash_val)
+        days.setdefault(date_key, []).append((hash_val, download_url, commit_title, commit_dt))
+    return days
+
+
+def render_entries(
+    entries: list[tuple[str, str, str, str]],
+    link_label: str,
+) -> str:
+    lines = []
+    for hash_val, download_url, commit_title, commit_dt in entries:
+        commit_url = f"{CODEBERG_BASE}/{CODEBERG_REPO}/commit/{hash_val}"
+        dt_str = f" · {commit_dt}" if commit_dt else ""
+        lines.append(
+            f"- [{commit_title}]({commit_url}){dt_str}  \n"
+            f"  [{link_label}]({download_url}) (`{hash_val}`)\n"
+        )
+    return "".join(lines)
+
+
+def main() -> None:
+    ssh_user = os.environ.get("SSH_USER", "")
+    ssh_host = os.environ.get("SSH_HOST", "")
+    if not ssh_user or not ssh_host:
+        print("SSH_USER and SSH_HOST must be set", file=sys.stderr)
+        sys.exit(1)
+
+    print(f"Listing Linux builds on {ssh_host}…")
+    linux_paths = list_remote_files(ssh_user, ssh_host, "sharedinbox-linux-amd64-*.tar.gz")
+    print(f"Found {len(linux_paths)} Linux build(s)")
+    linux_re = re.compile(
+        r"public_html/builds/(\d{4})/(\d{2})/(\d{2})/(sharedinbox-linux-amd64-(.+)\.tar\.gz)$"
+    )
+    linux_days = parse_builds(linux_paths, linux_re)
+
+    print(f"Listing Android APKs on {ssh_host}…")
+    apk_paths = list_remote_files(ssh_user, ssh_host, "*.apk")
+    print(f"Found {len(apk_paths)} APK(s)")
+    apk_re = re.compile(
+        r"public_html/builds/(\d{4})/(\d{2})/(\d{2})/(sharedinbox-mua-(.+)\.apk)$"
+    )
+    android_days = parse_builds(apk_paths, apk_re)
+
+    CONTENT_DIR.mkdir(parents=True, exist_ok=True)
+
+    # _index.md: platform sections, newest-first within each
+    index_lines = ["---\ntitle: Builds\n---\n\n"]
+
+    index_lines.append(f"## Linux (last {MAX_BUILDS_PER_PLATFORM})\n\n")
+    if linux_days:
+        for date_key in sorted(linux_days, reverse=True):
+            year, month, day = date_key.split("/")
+            index_lines.append(f"### {year}-{month}-{day}\n\n")
+            index_lines.append(render_entries(linux_days[date_key], "Download"))
+            index_lines.append("\n")
+    else:
+        index_lines.append("_No Linux builds yet._\n\n")
+
+    index_lines.append(f"## Android (last {MAX_BUILDS_PER_PLATFORM})\n\n")
+    if android_days:
+        for date_key in sorted(android_days, reverse=True):
+            year, month, day = date_key.split("/")
+            index_lines.append(f"### {year}-{month}-{day}\n\n")
+            index_lines.append(render_entries(android_days[date_key], "Download APK"))
+            index_lines.append("\n")
+    else:
+        index_lines.append("_No Android builds yet._\n\n")
+
+    (CONTENT_DIR / "_index.md").write_text("".join(index_lines), encoding="utf-8")
+
+    # Per-day pages (combined)
+    all_days = set(linux_days) | set(android_days)
+    for date_key in sorted(all_days):
+        year, month, day = date_key.split("/")
+        date_iso = f"{year}-{month}-{day}"
+        day_dir = CONTENT_DIR / year / month
+        day_dir.mkdir(parents=True, exist_ok=True)
+
+        lines = [f"---\ntitle: 'Builds for {date_iso}'\ndate: {date_iso}T00:00:00Z\n---\n\n"]
+        if date_key in linux_days:
+            lines.append("## Linux\n\n")
+            lines.append(render_entries(linux_days[date_key], "Download"))
+            lines.append("\n")
+        if date_key in android_days:
+            lines.append("## Android\n\n")
+            lines.append(render_entries(android_days[date_key], "Download APK"))
+            lines.append("\n")
+        (day_dir / f"{day}.md").write_text("".join(lines), encoding="utf-8")
+
+    total_linux = sum(len(v) for v in linux_days.values())
+    total_android = sum(len(v) for v in android_days.values())
+    print(
+        f"Generated pages: {total_linux} Linux build(s), {total_android} Android build(s) "
+        f"across {len(all_days)} day(s)"
+    )
+
+
+if __name__ == "__main__":
+    main()

scripts/test_agent_loop.py

@@ -0,0 +1,207 @@
+#!/usr/bin/env python3
+"""Tests for agent_loop.py."""
+import io
+import json
+import os
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import sys
+sys.path.insert(0, str(Path(__file__).parent))
+
+import agent_loop
+
+
+class TestStateFile(unittest.TestCase):
+    def setUp(self):
+        self._tmp = tempfile.NamedTemporaryFile(delete=False, suffix=".json")
+        self._tmp.close()
+        self._orig = agent_loop.STATE_FILE
+        agent_loop.STATE_FILE = Path(self._tmp.name)
+        Path(self._tmp.name).unlink()  # Start with no state file.
+
+    def tearDown(self):
+        agent_loop.STATE_FILE = self._orig
+        Path(self._tmp.name).unlink(missing_ok=True)
+
+    def test_write_state_stores_pid(self):
+        agent_loop._write_state(12345, 91, "issue")
+        data = json.loads(Path(self._tmp.name).read_text())
+        self.assertEqual(data["pid"], 12345)
+        self.assertNotIn("tmux_session", data)
+
+    def test_write_state_stores_issue_and_kind(self):
+        agent_loop._write_state(99, 7, "ci-fix")
+        data = json.loads(Path(self._tmp.name).read_text())
+        self.assertEqual(data["issue"], 7)
+        self.assertEqual(data["type"], "ci-fix")
+        self.assertIn("started_at", data)
+
+    def test_read_state_returns_none_when_missing(self):
+        self.assertIsNone(agent_loop._read_state())
+
+    def test_read_and_write_roundtrip(self):
+        agent_loop._write_state(42, 10, "issue")
+        state = agent_loop._read_state()
+        self.assertIsNotNone(state)
+        self.assertEqual(state["pid"], 42)
+        self.assertEqual(state["issue"], 10)
+
+    def test_clear_state_removes_file(self):
+        agent_loop._write_state(1, None, "ci-fix")
+        agent_loop._clear_state()
+        self.assertIsNone(agent_loop._read_state())
+
+
+class TestAgentAlive(unittest.TestCase):
+    def test_own_pid_is_alive(self):
+        self.assertTrue(agent_loop._agent_alive({"pid": os.getpid()}))
+
+    def test_nonexistent_pid_is_dead(self):
+        self.assertFalse(agent_loop._agent_alive({"pid": 999999999}))
+
+    def test_missing_pid_returns_false(self):
+        self.assertFalse(agent_loop._agent_alive({}))
+        self.assertFalse(agent_loop._agent_alive({"pid": None}))
+
+
+class TestKillAgent(unittest.TestCase):
+    def test_kill_sends_sigkill(self):
+        with patch("agent_loop.os.kill") as mock_kill:
+            agent_loop._kill_agent({"pid": 1234})
+            mock_kill.assert_called_once_with(1234, 9)
+
+    def test_kill_ignores_missing_process(self):
+        with patch("agent_loop.os.kill", side_effect=ProcessLookupError):
+            agent_loop._kill_agent({"pid": 1234})  # Should not raise.
+
+    def test_kill_noop_when_no_pid(self):
+        with patch("agent_loop.os.kill") as mock_kill:
+            agent_loop._kill_agent({})
+            mock_kill.assert_not_called()
+
+
+class TestStartAgent(unittest.TestCase):
+    def _make_mock_proc(self, pid=42):
+        proc = MagicMock()
+        proc.pid = pid
+        proc.stdin = io.BytesIO()
+        return proc
+
+    def test_start_agent_returns_pid(self):
+        mock_proc = self._make_mock_proc(pid=42)
+        with tempfile.TemporaryDirectory() as tmpdir:
+            with patch("agent_loop.subprocess.Popen", return_value=mock_proc):
+                with patch.object(agent_loop.Path, "home", return_value=Path(tmpdir)):
+                    result = agent_loop._start_agent("do something", "issue-99")
+        self.assertEqual(result, 42)
+
+    def test_start_agent_uses_popen_not_tmux(self):
+        mock_proc = self._make_mock_proc(pid=7)
+        with tempfile.TemporaryDirectory() as tmpdir:
+            with patch("agent_loop.subprocess.Popen", return_value=mock_proc) as mock_popen:
+                with patch("agent_loop.subprocess.run") as mock_run:
+                    with patch.object(agent_loop.Path, "home", return_value=Path(tmpdir)):
+                        agent_loop._start_agent("prompt", "ci-fix")
+            mock_popen.assert_called_once()
+            mock_run.assert_not_called()
+
+    def test_start_agent_passes_session_name_to_claude(self):
+        mock_proc = self._make_mock_proc(pid=7)
+        with tempfile.TemporaryDirectory() as tmpdir:
+            with patch("agent_loop.subprocess.Popen", return_value=mock_proc) as mock_popen:
+                with patch.object(agent_loop.Path, "home", return_value=Path(tmpdir)):
+                    agent_loop._start_agent("prompt", "issue-55")
+            cmd = mock_popen.call_args[0][0]
+            self.assertIn("issue-55", cmd)
+            self.assertIn("claude", cmd[0])
+
+    def test_start_agent_uses_start_new_session(self):
+        mock_proc = self._make_mock_proc(pid=7)
+        with tempfile.TemporaryDirectory() as tmpdir:
+            with patch("agent_loop.subprocess.Popen", return_value=mock_proc) as mock_popen:
+                with patch.object(agent_loop.Path, "home", return_value=Path(tmpdir)):
+                    agent_loop._start_agent("prompt", "issue-55")
+            kwargs = mock_popen.call_args[1]
+            self.assertTrue(kwargs.get("start_new_session"))
+
+
+class TestMain(unittest.TestCase):
+    """Tests for the main() flow."""
+
+    def _make_mock_proc(self, pid=42):
+        proc = MagicMock()
+        proc.pid = pid
+        proc.stdin = io.BytesIO()
+        return proc
+
+    def _make_issue(self, number=10, title="Do something"):
+        return {"number": number, "title": title, "body": "", "labels": []}
+
+    def test_sets_in_progress_before_starting_agent(self):
+        """_set_labels(InProgress) must be called before _start_agent."""
+        call_order = []
+        mock_proc = self._make_mock_proc(pid=55)
+
+        def fake_set_labels(issue, add, remove):
+            call_order.append(("set_labels", add, remove))
+
+        def fake_start_agent(prompt, session_name):
+            call_order.append(("start_agent", session_name))
+            return 55
+
+        with patch("agent_loop._read_state", return_value=None), \
+             patch("agent_loop._latest_ci_run", return_value=None), \
+             patch("agent_loop._ready_issues", return_value=[self._make_issue(10)]), \
+             patch("agent_loop._set_labels", side_effect=fake_set_labels), \
+             patch("agent_loop._start_agent", side_effect=fake_start_agent), \
+             patch("agent_loop._write_state"):
+            result = agent_loop.main()
+
+        self.assertEqual(result, 0)
+        labels_idx = next(
+            i for i, c in enumerate(call_order) if c[0] == "set_labels"
+        )
+        agent_idx = next(
+            i for i, c in enumerate(call_order) if c[0] == "start_agent"
+        )
+        self.assertLess(labels_idx, agent_idx,
+                        "_set_labels must be called before _start_agent")
+
+    def test_sets_in_progress_label_and_removes_ready(self):
+        """The InProgress label is added and the Ready label is removed."""
+        captured = {}
+
+        def fake_set_labels(issue, add, remove):
+            captured["add"] = add
+            captured["remove"] = remove
+
+        with patch("agent_loop._read_state", return_value=None), \
+             patch("agent_loop._latest_ci_run", return_value=None), \
+             patch("agent_loop._ready_issues", return_value=[self._make_issue(7)]), \
+             patch("agent_loop._set_labels", side_effect=fake_set_labels), \
+             patch("agent_loop._start_agent", return_value=99), \
+             patch("agent_loop._write_state"):
+            agent_loop.main()
+
+        self.assertIn(agent_loop.LABEL_IN_PROGRESS, captured.get("add", []))
+        self.assertIn(agent_loop.LABEL_READY, captured.get("remove", []))
+
+    def test_no_ready_issues_does_nothing(self):
+        """main() exits cleanly with 0 when there are no ready issues."""
+        with patch("agent_loop._read_state", return_value=None), \
+             patch("agent_loop._latest_ci_run", return_value=None), \
+             patch("agent_loop._ready_issues", return_value=[]), \
+             patch("agent_loop._set_labels") as mock_labels, \
+             patch("agent_loop._start_agent") as mock_start:
+            result = agent_loop.main()
+
+        self.assertEqual(result, 0)
+        mock_labels.assert_not_called()
+        mock_start.assert_not_called()
+
+
+if __name__ == "__main__":
+    unittest.main()

scripts/test_generate_build_history.py

@@ -0,0 +1,113 @@
+#!/usr/bin/env python3
+"""Tests for pure functions in generate_build_history.py."""
+import re
+import unittest
+from unittest.mock import patch
+
+from generate_build_history import MAX_BUILDS_PER_PLATFORM, parse_builds, render_entries
+
+LINUX_RE = re.compile(
+    r"public_html/builds/(\d{4})/(\d{2})/(\d{2})/(sharedinbox-linux-amd64-(.+)\.tar\.gz)$"
+)
+APK_RE = re.compile(
+    r"public_html/builds/(\d{4})/(\d{2})/(\d{2})/(sharedinbox-mua-(.+)\.apk)$"
+)
+
+
+def _fake_commit_info(hash_val: str):
+    return (f"feat: {hash_val}", "2025-05-10T12:00:00Z")
+
+
+class TestParseBuilds(unittest.TestCase):
+    def setUp(self):
+        patcher = patch("generate_build_history.get_commit_info", side_effect=_fake_commit_info)
+        self.mock_commit = patcher.start()
+        self.addCleanup(patcher.stop)
+
+    def test_linux_path_parsed(self):
+        paths = ["public_html/builds/2025/05/10/sharedinbox-linux-amd64-abc1234.tar.gz"]
+        result = parse_builds(paths, LINUX_RE)
+        self.assertIn("2025/05/10", result)
+        entry = result["2025/05/10"][0]
+        self.assertEqual(entry[0], "abc1234")
+        self.assertIn("sharedinbox-linux-amd64-abc1234.tar.gz", entry[1])
+
+    def test_apk_path_parsed(self):
+        paths = ["public_html/builds/2025/05/11/sharedinbox-mua-def5678.apk"]
+        result = parse_builds(paths, APK_RE)
+        self.assertIn("2025/05/11", result)
+        entry = result["2025/05/11"][0]
+        self.assertEqual(entry[0], "def5678")
+        self.assertIn("sharedinbox-mua-def5678.apk", entry[1])
+
+    def test_unexpected_path_skipped(self):
+        paths = [
+            "public_html/builds/2025/05/10/sharedinbox-linux-amd64-abc1234.tar.gz",
+            "public_html/builds/bad-path/other.tar.gz",
+        ]
+        result = parse_builds(paths, LINUX_RE)
+        self.assertEqual(len(result), 1)
+
+    def test_multiple_builds_same_day(self):
+        paths = [
+            "public_html/builds/2025/05/10/sharedinbox-linux-amd64-aaa0001.tar.gz",
+            "public_html/builds/2025/05/10/sharedinbox-linux-amd64-bbb0002.tar.gz",
+        ]
+        result = parse_builds(paths, LINUX_RE)
+        self.assertEqual(len(result["2025/05/10"]), 2)
+
+    def test_limited_to_max_builds(self):
+        paths = [
+            f"public_html/builds/2025/05/{i:02d}/sharedinbox-linux-amd64-hash{i:03d}.tar.gz"
+            for i in range(1, MAX_BUILDS_PER_PLATFORM + 5)
+        ]
+        result = parse_builds(paths, LINUX_RE)
+        total = sum(len(v) for v in result.values())
+        self.assertEqual(total, MAX_BUILDS_PER_PLATFORM)
+
+    def test_download_url_contains_date_and_filename(self):
+        paths = ["public_html/builds/2025/03/15/sharedinbox-linux-amd64-cafebabe.tar.gz"]
+        result = parse_builds(paths, LINUX_RE)
+        url = result["2025/03/15"][0][1]
+        self.assertIn("/2025/03/15/", url)
+        self.assertIn("sharedinbox-linux-amd64-cafebabe.tar.gz", url)
+        self.assertTrue(url.startswith("https://"))
+
+
+class TestRenderEntries(unittest.TestCase):
+    def _make_entry(self, hash_val="abc1234", url="https://example.com/file.apk",
+                    title="feat: something", dt="2025-05-10T12:00:00Z"):
+        return (hash_val, url, title, dt)
+
+    def test_output_contains_title_and_link(self):
+        entry = self._make_entry()
+        out = render_entries([entry], "Download APK")
+        self.assertIn("feat: something", out)
+        self.assertIn("Download APK", out)
+        self.assertIn("abc1234", out)
+
+    def test_commit_url_uses_hash(self):
+        entry = self._make_entry(hash_val="deadbeef")
+        out = render_entries([entry], "Download")
+        self.assertIn("deadbeef", out)
+        self.assertIn("codeberg.org", out)
+
+    def test_datetime_shown_when_present(self):
+        entry = self._make_entry(dt="2025-05-10T12:00:00Z")
+        out = render_entries([entry], "Download")
+        self.assertIn("2025-05-10T12:00:00Z", out)
+
+    def test_datetime_omitted_when_empty(self):
+        entry = self._make_entry(dt="")
+        out = render_entries([entry], "Download")
+        self.assertNotIn(" · ", out)
+
+    def test_multiple_entries_all_rendered(self):
+        entries = [self._make_entry(hash_val=f"hash{i}", title=f"commit {i}") for i in range(3)]
+        out = render_entries(entries, "Download")
+        for i in range(3):
+            self.assertIn(f"commit {i}", out)
+
+
+if __name__ == "__main__":
+    unittest.main()

shared-pub-cache-setup.md

@@ -0,0 +1,108 @@
+# Shared Flutter & Dart Pub Cache Configuration
+
+This guide provides the instructions to configure a centralized, robust `pub-cache` for a Linux
+environment acting as both a local development workstation and a Dagger CI runner.
+
+
+The `pub-cache` is the local directory where Dart and Flutter store downloaded packages
+(dependencies) fetched from `pub.dev` or other package repositories. By default, it resides in
+`~/.pub-cache` (or `~/.local/share/pub-cache` on some Linux setups) for each individual user. When
+multiple users or CI runners operate on the same machine, they end up downloading the same packages
+redundantly, wasting disk space and network bandwidth.
+
+This setup aggressively prevents permission drift between local user accounts and CI service
+accounts. It also strictly forbids `pub global activate` via OS-level directory permissions to
+guarantee a 100% collision-free environment, effectively forcing
+roject-level dependency
+management.
+
+---
+
+## Prerequisites
+- Root (`sudo`) access to the Linux host machine.
+- The `acl` package installed (standard on most modern distributions like Ubuntu).
+
+## Step 1: Create the Dedicated Group and Directory
+Establish a shared user group for all human developers and CI service accounts, and provision the
+central cache directory.
+
+```bash
+# Create the shared group
+sudo groupadd flutter-devs
+
+# Add your local user to the group
+sudo usermod -aG flutter-devs $USER
+
+# Add the CI runner service account to the group (e.g., 'dagger' or 'gitlab-runner')
+# sudo usermod -aG flutter-devs <ci-service-user>
+
+# Create the centralized cache directory in /opt
+sudo mkdir -p /opt/pub-cache
+sudo chown root:flutter-devs /opt/pub-cache
+
+
+Step 2: Enforce Strict Group Permissions (ACLs)
+Standard Linux permissions result in the creator of a file owning it exclusively. To prevent permission drift when Dagger or the local user pulls dependencies, apply Access Control Lists (ACLs). This forces all newly created subdirectories and files to inherit read, write, and execute permissions for the flutter-devs group.
+
+Bash
+
+
+# Set the SetGID bit so new files inherit the 'flutter-devs' group
+sudo chmod 2775 /opt/pub-cache
+
+# Apply default ACLs to enforce rwx for the group on all future files/folders
+sudo setfacl -d -m g:flutter-devs:rwx /opt/pub-cache
+
+# Apply the same ACLs to the directory itself immediately
+sudo setfacl -m g:flutter-devs:rwx /opt/pub-cache
+
+
+Step 3: Export the Environment Variable
+You must instruct Dart and Flutter to utilize this central location instead of the default ~/.pub-cache.
+A. Global Host Setup
+For system-wide application, drop an environment script into /etc/profile.d/.
+
+Bash
+
+
+echo 'export PUB_CACHE=/opt/pub-cache' | sudo tee /etc/profile.d/flutter-pub-cache.sh
+echo 'export PATH="$PATH:$PUB_CACHE/bin"' | sudo tee -a /etc/profile.d/flutter-pub-cache.sh
+
+
+(Note: Users will need to log out and log back in, or source the profile, for this to take effect).
+B. Dagger Pipeline Integration (Go SDK)
+When writing your Dagger pipeline controller, mount the host directory directly into the container so the CI runner uses the identical cache pool:
+
+Go
+
+
+// In your Dagger CI logic, mount the shared host cache into the container
+WithMountedDirectory("/root/.pub-cache", dag.Host().Directory("/opt/pub-cache")).
+WithEnvVariable("PUB_CACHE", "/root/.pub-cache")
+
+
+Step 4: The 100% Strict Lockdown for Global Activations
+Running dart pub global activate <package> in a shared cache causes severe conflicts by overwriting global executables. To guarantee this never happens, we revoke write access to the specific global activation subdirectories.
+By implementing this OS-level constraint, any attempt to globally activate a package—regardless of multiline bash scripts, variables, or clever aliases—will be unconditionally rejected by the Linux kernel with a Permission denied error. Standard pub get commands for project dependencies will continue working without issue.
+
+Bash
+
+
+# Ensure the target subdirectories exist
+sudo mkdir -p /opt/pub-cache/bin
+sudo mkdir -p /opt/pub-cache/global_packages
+
+# Change ownership of exclusively these two directories to root
+sudo chown root:root /opt/pub-cache/bin
+sudo chown root:root /opt/pub-cache/global_packages
+
+# Remove write permissions for everyone else
+sudo chmod 755 /opt/pub-cache/bin
+sudo chmod 755 /opt/pub-cache/global_packages
+
+
+Developer Workflow Impact
+Because global activations are now entirely disabled on this host, developers and CI scripts must manage CLI tools locally.
+If a tool like melos, slidy, or coverage is required:
+Add it to the dev_dependencies of your pubspec.yaml.
+Invoke it project-locally using dart run <package_name>.

stalwart-dev/integration_ui_test.sh

@@ -22,8 +22,8 @@ export STALWART_TMPDIR
 TEST_HOME="$(mktemp -d /tmp/sharedinbox-test-home-XXXXXX)"
 
 cleanup() {
-    kill "${STALWART_PID:-}" 2>/dev/null || true
-    wait "${STALWART_PID:-}" 2>/dev/null || true
+    kill "${STALWART_PID:-}" "${XVFB_PID:-}" 2>/dev/null || true
+    wait "${STALWART_PID:-}" "${XVFB_PID:-}" 2>/dev/null || true
     rm -rf "$TEST_HOME"
 }
 trap cleanup EXIT
@@ -46,7 +46,7 @@ command -v xvfb-run >/dev/null || {
 # but the leftover Xvfb's stale /tmp/.X11-unix/X<N> socket and lock file confuse
 # its cleanup, producing "kill: No such process" on exit and a non-zero status
 # even when the test itself passed.
-for _xvfb_pid in $(pgrep -u "$USER" -x Xvfb 2>/dev/null); do
+for _xvfb_pid in $(pgrep -u "${USER:-$(id -un)}" -x Xvfb 2>/dev/null); do
     _xvfb_display=$(tr '\0' ' ' < "/proc/${_xvfb_pid}/cmdline" 2>/dev/null \
         | grep -oE ':[0-9]+' | head -1)
     kill "$_xvfb_pid" 2>/dev/null || true
@@ -105,12 +105,63 @@ export XDG_DATA_HOME="$TEST_HOME"
 
 ts "flutter test start"
 
-# xvfb-run provides a virtual framebuffer so the Flutter Linux runner has a
-# display without requiring a real desktop session.  No D-Bus or keyring daemon
-# is needed because the integration tests inject an in-memory SecureStorage.
-# +iglx enables indirect GLX on Xvfb so Flutter/GTK3 can create an OpenGL context
-# using mesa's software renderer (LIBGL_ALWAYS_SOFTWARE=1 is set in flake.nix).
-xvfb-run --auto-servernum --server-args="-screen 0 1280x720x24 +iglx" \
-    fvm flutter test integration_test/ -d linux
+# Kill any orphan sharedinbox/flutter processes left by previous CI runs.
+# Stale processes can hold onto the Xvfb display, causing the new Flutter app
+# to hang indefinitely during GTK initialisation without ever connecting back
+# to the flutter test runner.
+pkill -u "${USER:-$(id -un)}" -f "sharedinbox" 2>/dev/null || true
+pkill -u "${USER:-$(id -un)}" -f "flutter.*integration" 2>/dev/null || true
+sleep 1
+
+# Find an unused display number.
+_display=99
+while [ -e "/tmp/.X${_display}-lock" ]; do _display=$((_display + 1)); done
+
+# Manage Xvfb directly instead of via xvfb-run.  xvfb-run catches SIGTERM,
+# kills its children, and exits 0 — so `timeout 240 xvfb-run ...` exits 0 on
+# timeout, making a stuck/timed-out test indistinguishable from a pass.
+# Running Xvfb ourselves lets us capture fvm flutter test's real exit code.
+# +iglx: indirect GLX so Flutter/GTK3 gets an OpenGL context via mesa software
+# renderer (LIBGL_ALWAYS_SOFTWARE=1 is set in flake.nix).
+Xvfb ":${_display}" -screen 0 1280x720x24 +iglx &
+XVFB_PID=$!
+export DISPLAY=":${_display}"
+
+# Wait for the Xvfb Unix socket to appear (up to 5 s).
+for _xi in $(seq 1 10); do
+    [ -S "/tmp/.X11-unix/X${_display}" ] && break
+    sleep 0.5
+done
+[ -S "/tmp/.X11-unix/X${_display}" ] || { echo "Xvfb :${_display} did not start"; exit 1; }
+
+# Retry once: if the first attempt gets stuck in GTK/display init,
+# a fresh Xvfb on a new display number usually succeeds on the second try.
+_e2e_exit=0
+for _attempt in 1 2; do
+    ts "E2E attempt $_attempt (DISPLAY=$DISPLAY)"
+    # Use || to capture exit code without triggering set -e on failure.
+    _e2e_exit=0
+    timeout 360 fvm flutter test integration_test/ -d linux || _e2e_exit=$?
+    [ "$_e2e_exit" -eq 0 ] && break || true
+    if [ $_attempt -lt 2 ]; then
+        ts "E2E attempt $_attempt failed (exit $_e2e_exit), restarting Xvfb and retrying..."
+        pkill -u "${USER:-$(id -un)}" -f "sharedinbox" 2>/dev/null || true
+        # Kill the old Xvfb and start a fresh one on a new display number.
+        kill "${XVFB_PID:-}" 2>/dev/null || true
+        wait "${XVFB_PID:-}" 2>/dev/null || true
+        rm -f "/tmp/.X${_display}-lock" "/tmp/.X11-unix/X${_display}" 2>/dev/null || true
+        _display=$((_display + 1))
+        while [ -e "/tmp/.X${_display}-lock" ]; do _display=$((_display + 1)); done
+        Xvfb ":${_display}" -screen 0 1280x720x24 +iglx &
+        XVFB_PID=$!
+        export DISPLAY=":${_display}"
+        for _xi in $(seq 1 10); do
+            [ -S "/tmp/.X11-unix/X${_display}" ] && break
+            sleep 0.5
+        done
+        sleep 2
+    fi
+done
+[ $_e2e_exit -eq 0 ] || exit $_e2e_exit
 
 ts "flutter test done"

stalwart-dev/test.sh

@@ -17,6 +17,10 @@ command -v stalwart >/dev/null || {
     exit 1
 }
 
+# Kill any stalwart left over from a previous run (the CI self-hosted runner
+# keeps processes alive across jobs when a run is killed externally).
+pkill -x stalwart 2>/dev/null && sleep 0.5 || true
+
 # Pre-seed spam-filter version so Stalwart does not fetch it on first boot.
 mkdir -p "$STALWART_TMPDIR"
 sqlite3 "${STALWART_TMPDIR}/data.sqlite" \
@@ -66,21 +70,20 @@ START=$(date +%s)
 run_tests() {
   # If unit tests already produced a coverage baseline, merge integration coverage
   # into it so the final gate reflects both suites.
-  local target="${1:-test/integration/}"
+  local target="${1:-test/backend/}"
   if [ -f coverage/lcov.info ]; then
     cp coverage/lcov.info coverage/lcov.base.info
-    fvm flutter test --concurrency=1 --coverage --merge-coverage --reporter expanded "$target" >"$tmp" 2>&1
+    flutter test --concurrency=1 --coverage --merge-coverage --reporter compact "$target" >"$tmp" 2>&1
     rm -f coverage/lcov.base.info
   else
-    fvm flutter test --concurrency=1 --reporter expanded "$target" >"$tmp" 2>&1
+    flutter test --concurrency=1 --reporter compact "$target" >"$tmp" 2>&1
   fi
 }
 if run_tests "${@:-}"; then
-  cat "$tmp"
   grep -E "^All [0-9]+ tests passed" "$tmp" || tail -1 "$tmp"
 else
   cat "$tmp"
   exit 1
 fi
 END=$(date +%s)
-echo "integration: $((END - START))s"
+echo "test-backend: $((END - START))s"

test/backend/account_sync_manager_test.dart

@@ -1,5 +1,7 @@
 import 'dart:async';
+import 'dart:io';
 
+import 'package:enough_mail/enough_mail.dart' as imap;
 import 'package:flutter_test/flutter_test.dart';
 import 'package:sharedinbox/core/models/account.dart';
 import 'package:sharedinbox/core/models/email.dart';
@@ -10,8 +12,16 @@ import 'package:sharedinbox/core/repositories/mailbox_repository.dart';
 import 'package:sharedinbox/core/repositories/sync_log_repository.dart';
 import 'package:sharedinbox/core/sync/account_sync_manager.dart';
 
+Future<imap.ImapClient> _fakeImapConnect(
+  Account account,
+  String username,
+  String password,
+) async =>
+    throw const SocketException('fake — no real IMAP server in tests');
+
 void main() {
-  test('AccountSyncManager schedules sync for multiple accounts', () async {
+  test('AccountSyncManager schedules IMAP sync for multiple accounts',
+      () async {
     final accounts = _FakeAccounts('pw');
     final mailboxes = _FakeMailboxes();
     final emails = _FakeEmails();
@@ -22,6 +32,7 @@ void main() {
       mailboxes,
       emails,
       syncLog: logs,
+      imapConnect: _fakeImapConnect,
     );
 
     final a1 = _account('1');
@@ -38,6 +49,34 @@ void main() {
 
     manager.dispose();
   });
+
+  test('AccountSyncManager schedules JMAP sync for multiple accounts',
+      () async {
+    final accounts = _FakeAccounts('pw');
+    final mailboxes = _FakeMailboxes();
+    final emails = _FakeEmails();
+    final logs = _FakeLogs();
+
+    final manager = AccountSyncManager(
+      accounts,
+      mailboxes,
+      emails,
+      syncLog: logs,
+    );
+
+    final a1 = _jmapAccount('1');
+    final a2 = _jmapAccount('2');
+
+    manager.start();
+    accounts.push([a1, a2]);
+
+    await Future<void>.delayed(const Duration(milliseconds: 100));
+
+    expect(emails.syncCounts['1'], greaterThanOrEqualTo(1));
+    expect(emails.syncCounts['2'], greaterThanOrEqualTo(1));
+
+    manager.dispose();
+  });
 }
 
 Account _account(String id) => Account(
@@ -52,6 +91,17 @@ Account _account(String id) => Account(
       smtpSsl: false,
     );
 
+Account _jmapAccount(String id) => Account(
+      id: id,
+      displayName: 'Account $id',
+      email: '$id@example.com',
+      type: AccountType.jmap,
+      jmapUrl: 'http://localhost:8080/.well-known/jmap',
+      smtpHost: 'localhost',
+      smtpPort: 25,
+      smtpSsl: false,
+    );
+
 class _FakeAccounts implements AccountRepository {
   _FakeAccounts(this.password);
   final String password;
@@ -105,10 +155,19 @@ class _FakeEmails implements EmailRepository {
   final syncCounts = <String, int>{};
 
   @override
-  Stream<List<Email>> observeEmails(String a, String m) => Stream.value([]);
+  Stream<List<Email>> observeEmails(
+    String a,
+    String m, {
+    int limit = 50,
+  }) =>
+      Stream.value([]);
 
   @override
-  Stream<List<EmailThread>> observeThreads(String a, String m) =>
+  Stream<List<EmailThread>> observeThreads(
+    String a,
+    String m, {
+    int limit = 50,
+  }) =>
       Stream.value([]);
 
   @override
@@ -131,6 +190,9 @@ class _FakeEmails implements EmailRepository {
   @override
   Future<void> setFlag(String id, {bool? seen, bool? flagged}) async {}
 
+  @override
+  Future<void> markAllAsRead(String accountId, String mailboxPath) async {}
+
   @override
   Future<void> moveEmail(String id, String dest) async {}
 
@@ -146,6 +208,13 @@ class _FakeEmails implements EmailRepository {
   @override
   Future<void> restoreEmails(List<Email> emails) async {}
 
+  @override
+  Future<Email?> findEmailByMessageId(
+    String accountId,
+    String messageId,
+  ) async =>
+      null;
+
   @override
   Future<String?> deleteEmail(String id) async => null;
 
@@ -165,6 +234,9 @@ class _FakeEmails implements EmailRepository {
   ) async =>
       '/tmp/${attachment.filename}';
 
+  @override
+  Future<String> fetchRawRfc822(String emailId) async => '';
+
   @override
   Future<List<Email>> searchEmails(String a, String m, String q) async => [];
 
@@ -174,6 +246,14 @@ class _FakeEmails implements EmailRepository {
   @override
   Future<List<Email>> getEmailsByAddress(String? a, String address) async => [];
 
+  @override
+  Future<List<EmailAddress>> searchAddresses(
+    String? a,
+    String q, {
+    int limit = 10,
+  }) async =>
+      [];
+
   @override
   Stream<void> watchJmapPush(String accountId, String password) =>
       const Stream.empty();
@@ -197,6 +277,9 @@ class _FakeEmails implements EmailRepository {
 
   @override
   Future<void> clearForResync(String accountId) async {}
+
+  @override
+  Future<int> applySieveRules(String accountId) async => 0;
 }
 
 class _FakeLogs implements SyncLogRepository {

test/backend/email_repository_imap_test.dart

@@ -8,6 +8,7 @@
 
 import 'dart:convert';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:drift/drift.dart' show Value;
 import 'package:enough_mail/enough_mail.dart';
@@ -564,4 +565,60 @@ void main() {
     expect(pending, hasLength(1));
     expect(pending.first.changeType, 'delete');
   });
+
+  test('downloadAttachment fetches binary attachment bytes from IMAP',
+      () async {
+    final attachmentBytes = Uint8List.fromList(
+      List.generate(32, (i) => i + 1),
+    );
+    const attachmentName = 'hello.bin';
+    const attachmentMime = 'application/octet-stream';
+
+    // Build a multipart email with a binary attachment and append it.
+    final client = await _imapConnect(
+      host: imapHost,
+      port: imapPort,
+      user: userEmail,
+      pass: userPass,
+    );
+    try {
+      final builder = MessageBuilder()
+        ..from = [MailAddress('Alice', userEmail)]
+        ..to = [MailAddress('Alice', userEmail)]
+        ..subject = 'attach-${DateTime.now().millisecondsSinceEpoch}'
+        ..text = 'See attachment.';
+      builder.addBinary(
+        attachmentBytes,
+        MediaType.fromText(attachmentMime),
+        filename: attachmentName,
+      );
+      await client.appendMessage(
+        builder.buildMimeMessage(),
+        targetMailboxPath: 'INBOX',
+      );
+    } finally {
+      await client.logout();
+    }
+
+    final r = makeRepo();
+    await r.accounts.addAccount(account, userPass);
+    await r.emails.syncEmails('test', 'INBOX');
+
+    final emails = await r.emails.observeEmails('test', 'INBOX').first;
+    expect(emails, hasLength(1));
+    expect(emails.first.hasAttachment, isTrue);
+
+    final body = await r.emails.getEmailBody(emails.first.id);
+    expect(body.attachments, hasLength(1));
+    expect(body.attachments.first.filename, attachmentName);
+    expect(body.attachments.first.contentType, attachmentMime);
+    expect(body.attachments.first.fetchPartId, isNotEmpty);
+
+    final path = await r.emails.downloadAttachment(
+      emails.first.id,
+      body.attachments.first,
+    );
+    final downloaded = await File(path).readAsBytes();
+    expect(downloaded, equals(attachmentBytes));
+  });
 }

test/unit/account_repository_contract_test.dart

@@ -0,0 +1,107 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:sharedinbox/core/models/account.dart';
+import 'package:sharedinbox/core/repositories/account_repository.dart';
+import 'package:sharedinbox/data/repositories/account_repository_impl.dart';
+
+import 'account_repository_impl_test.dart' show MapSecureStorage;
+import 'db_test_helper.dart';
+
+// ── Contract ──────────────────────────────────────────────────────────────────
+
+/// Verifies the [AccountRepository] interface contract.
+///
+/// Subclass this and override [makeRepo] to run the same suite against any
+/// concrete implementation.
+abstract class AccountRepositoryContract {
+  AccountRepository makeRepo();
+
+  static const _a = Account(
+    id: 'c-1',
+    displayName: 'Contract',
+    email: 'c@example.com',
+    imapHost: 'imap.example.com',
+    smtpHost: 'smtp.example.com',
+  );
+
+  void run() {
+    test('observeAccounts starts empty', () async {
+      final repo = makeRepo();
+      expect(await repo.observeAccounts().first, isEmpty);
+    });
+
+    test('addAccount makes account visible via observeAccounts', () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'pw');
+      final list = await repo.observeAccounts().first;
+      expect(list, hasLength(1));
+      expect(list.first.id, _a.id);
+    });
+
+    test('getAccount returns null for unknown id', () async {
+      final repo = makeRepo();
+      expect(await repo.getAccount('no-such'), isNull);
+    });
+
+    test('getAccount returns added account', () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'pw');
+      final a = await repo.getAccount(_a.id);
+      expect(a, isNotNull);
+      expect(a!.email, _a.email);
+    });
+
+    test('getPassword returns stored password', () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'secret123');
+      expect(await repo.getPassword(_a.id), 'secret123');
+    });
+
+    test('updateAccount reflects changes in observeAccounts', () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'pw');
+      final updated = _a.copyWith(displayName: 'Updated');
+      await repo.updateAccount(updated);
+      final list = await repo.observeAccounts().first;
+      expect(list.first.displayName, 'Updated');
+    });
+
+    test('updateAccount with password updates stored password', () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'old');
+      await repo.updateAccount(_a, password: 'new');
+      expect(await repo.getPassword(_a.id), 'new');
+    });
+
+    test('removeAccount makes account disappear from observeAccounts',
+        () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'pw');
+      await repo.removeAccount(_a.id);
+      expect(await repo.observeAccounts().first, isEmpty);
+    });
+
+    test('getAccount returns null after removeAccount', () async {
+      final repo = makeRepo();
+      await repo.addAccount(_a, 'pw');
+      await repo.removeAccount(_a.id);
+      expect(await repo.getAccount(_a.id), isNull);
+    });
+  }
+}
+
+// ── Impl under test ───────────────────────────────────────────────────────────
+
+class _AccountRepositoryImplContract extends AccountRepositoryContract {
+  @override
+  AccountRepository makeRepo() =>
+      AccountRepositoryImpl(openTestDatabase(), MapSecureStorage());
+}
+
+void main() {
+  setUpAll(configureSqliteForTests);
+
+  group('AccountRepositoryImpl satisfies AccountRepository contract', () {
+    _AccountRepositoryImplContract().run();
+  });
+}

test/unit/account_sync_manager_test.dart

@@ -34,9 +34,18 @@ void main() {
 
 class FakeEmailRepository implements EmailRepository {
   @override
-  Stream<List<Email>> observeEmails(String a, String m) => Stream.value([]);
+  Stream<List<Email>> observeEmails(
+    String a,
+    String m, {
+    int limit = 50,
+  }) =>
+      Stream.value([]);
   @override
-  Stream<List<EmailThread>> observeThreads(String a, String m) =>
+  Stream<List<EmailThread>> observeThreads(
+    String a,
+    String m, {
+    int limit = 50,
+  }) =>
       Stream.value([]);
   @override
   Stream<List<Email>> observeEmailsInThread(String a, String m, String t) =>
@@ -52,6 +61,8 @@ class FakeEmailRepository implements EmailRepository {
   @override
   Future<void> setFlag(String id, {bool? seen, bool? flagged}) async {}
   @override
+  Future<void> markAllAsRead(String accountId, String mailboxPath) async {}
+  @override
   Future<void> moveEmail(String id, String dest) async {}
 
   @override
@@ -66,6 +77,13 @@ class FakeEmailRepository implements EmailRepository {
   @override
   Future<void> restoreEmails(List<Email> emails) async {}
 
+  @override
+  Future<Email?> findEmailByMessageId(
+    String accountId,
+    String messageId,
+  ) async =>
+      null;
+
   @override
   Future<String?> deleteEmail(String id) async => null;
   @override
@@ -77,12 +95,21 @@ class FakeEmailRepository implements EmailRepository {
   @override
   Future<String> downloadAttachment(String id, EmailAttachment a) async => '';
   @override
+  Future<String> fetchRawRfc822(String emailId) async => '';
+  @override
   Future<List<Email>> searchEmails(String a, String m, String q) async => [];
   @override
   Future<List<Email>> searchEmailsGlobal(String? a, String q) async => [];
   @override
   Future<List<Email>> getEmailsByAddress(String? a, String address) async => [];
   @override
+  Future<List<EmailAddress>> searchAddresses(
+    String? a,
+    String q, {
+    int limit = 10,
+  }) async =>
+      [];
+  @override
   Stream<void> watchJmapPush(String a, String p) => const Stream.empty();
   @override
   Stream<List<FailedMutation>> observeFailedMutations(String a) =>
@@ -101,6 +128,9 @@ class FakeEmailRepository implements EmailRepository {
 
   @override
   Future<void> clearForResync(String accountId) async {}
+
+  @override
+  Future<int> applySieveRules(String accountId) async => 0;
 }
 
 class _Log {

test/unit/account_sync_manager_test.mocks.dart

@@ -216,8 +216,9 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
   @override
   _i4.Stream<List<_i2.Email>> observeEmails(
     String? accountId,
-    String? mailboxPath,
-  ) =>
+    String? mailboxPath, {
+    int? limit = 50,
+  }) =>
       (super.noSuchMethod(
         Invocation.method(
           #observeEmails,
@@ -225,6 +226,7 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
             accountId,
             mailboxPath,
           ],
+          {#limit: limit},
         ),
         returnValue: _i4.Stream<List<_i2.Email>>.empty(),
       ) as _i4.Stream<List<_i2.Email>>);
@@ -232,8 +234,9 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
   @override
   _i4.Stream<List<_i2.EmailThread>> observeThreads(
     String? accountId,
-    String? mailboxPath,
-  ) =>
+    String? mailboxPath, {
+    int? limit = 50,
+  }) =>
       (super.noSuchMethod(
         Invocation.method(
           #observeThreads,
@@ -241,6 +244,7 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
             accountId,
             mailboxPath,
           ],
+          {#limit: limit},
         ),
         returnValue: _i4.Stream<List<_i2.EmailThread>>.empty(),
       ) as _i4.Stream<List<_i2.EmailThread>>);
@@ -333,6 +337,23 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
         returnValueForMissingStub: _i4.Future<void>.value(),
       ) as _i4.Future<void>);
 
+  @override
+  _i4.Future<void> markAllAsRead(
+    String? accountId,
+    String? mailboxPath,
+  ) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #markAllAsRead,
+          [
+            accountId,
+            mailboxPath,
+          ],
+        ),
+        returnValue: _i4.Future<void>.value(),
+        returnValueForMissingStub: _i4.Future<void>.value(),
+      ) as _i4.Future<void>);
+
   @override
   _i4.Future<void> moveEmail(
     String? emailId,
@@ -401,6 +422,21 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
         )),
       ) as _i4.Future<String>);
 
+  @override
+  _i4.Future<String> fetchRawRfc822(String? emailId) => (super.noSuchMethod(
+        Invocation.method(
+          #fetchRawRfc822,
+          [emailId],
+        ),
+        returnValue: _i4.Future<String>.value(_i6.dummyValue<String>(
+          this,
+          Invocation.method(
+            #fetchRawRfc822,
+            [emailId],
+          ),
+        )),
+      ) as _i4.Future<String>);
+
   @override
   _i4.Future<List<_i2.Email>> searchEmails(
     String? accountId,
@@ -451,6 +487,25 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
         returnValue: _i4.Future<List<_i2.Email>>.value(<_i2.Email>[]),
       ) as _i4.Future<List<_i2.Email>>);
 
+  @override
+  _i4.Future<List<_i2.EmailAddress>> searchAddresses(
+    String? accountId,
+    String? query, {
+    int? limit = 10,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #searchAddresses,
+          [
+            accountId,
+            query,
+          ],
+          {#limit: limit},
+        ),
+        returnValue:
+            _i4.Future<List<_i2.EmailAddress>>.value(<_i2.EmailAddress>[]),
+      ) as _i4.Future<List<_i2.EmailAddress>>);
+
   @override
   _i4.Future<int> flushPendingChanges(
     String? accountId,
@@ -551,6 +606,31 @@ class MockEmailRepository extends _i1.Mock implements _i9.EmailRepository {
         returnValueForMissingStub: _i4.Future<void>.value(),
       ) as _i4.Future<void>);
 
+  @override
+  _i4.Future<_i2.Email?> findEmailByMessageId(
+    String? accountId,
+    String? messageId,
+  ) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #findEmailByMessageId,
+          [
+            accountId,
+            messageId,
+          ],
+        ),
+        returnValue: _i4.Future<_i2.Email?>.value(),
+      ) as _i4.Future<_i2.Email?>);
+
+  @override
+  _i4.Future<int> applySieveRules(String? accountId) => (super.noSuchMethod(
+        Invocation.method(
+          #applySieveRules,
+          [accountId],
+        ),
+        returnValue: _i4.Future<int>.value(0),
+      ) as _i4.Future<int>);
+
   @override
   _i4.Stream<void> watchJmapPush(
     String? accountId,

test/unit/apply_sieve_rules_test.dart

@@ -0,0 +1,303 @@
+import 'dart:convert';
+
+import 'package:drift/drift.dart' show Value;
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:sharedinbox/core/models/account.dart';
+import 'package:sharedinbox/data/db/database.dart' hide Account;
+import 'package:sharedinbox/data/repositories/account_repository_impl.dart';
+import 'package:sharedinbox/data/repositories/email_repository_impl.dart';
+
+import 'account_repository_impl_test.dart' show MapSecureStorage;
+import 'db_test_helper.dart';
+
+// ── Helpers ───────────────────────────────────────────────────────────────────
+
+const _account = Account(
+  id: 'sieve-acc',
+  displayName: 'Sieve Test',
+  email: 'sieve@example.com',
+  imapHost: 'imap.example.com',
+  smtpHost: 'smtp.example.com',
+);
+
+Future<(AppDatabase, EmailRepositoryImpl)> _makeSetup() async {
+  final db = openTestDatabase();
+  final storage = MapSecureStorage();
+  final accounts = AccountRepositoryImpl(db, storage);
+  await accounts.addAccount(_account, 'password');
+
+  final repo = EmailRepositoryImpl(db, accounts);
+  return (db, repo);
+}
+
+/// Inserts a minimal email row in the INBOX. Returns the row id.
+Future<String> _insertInboxEmail(
+  AppDatabase db, {
+  required String id,
+  required String messageId,
+  String subject = 'Test',
+  String from = 'sender@example.com',
+  String mailboxPath = 'INBOX',
+}) async {
+  await db.into(db.emails).insert(
+        EmailsCompanion.insert(
+          id: id,
+          accountId: _account.id,
+          mailboxPath: mailboxPath,
+          uid: int.parse(id.split(':').last),
+          subject: Value(subject),
+          receivedAt: DateTime.now(),
+          fromJson: Value(
+            jsonEncode([
+              {'name': '', 'email': from},
+            ]),
+          ),
+          messageId: Value(messageId),
+        ),
+      );
+  // Insert a thread row so _updateThread does not throw.
+  await db.into(db.threads).insertOnConflictUpdate(
+        ThreadsCompanion.insert(
+          id: id,
+          accountId: _account.id,
+          mailboxPath: mailboxPath,
+          latestDate: DateTime.now(),
+          latestEmailId: id,
+        ),
+      );
+  return id;
+}
+
+/// Creates an active Sieve script for the test account.
+Future<void> _insertSieveScript(AppDatabase db, String content) async {
+  await db.into(db.localSieveScripts).insert(
+        LocalSieveScriptsCompanion.insert(
+          accountId: _account.id,
+          name: 'test-script',
+          content: Value(content),
+          isActive: const Value(true),
+        ),
+      );
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+void main() {
+  setUpAll(configureSqliteForTests);
+
+  group('applySieveRules', () {
+    test('returns 0 when no active script exists', () async {
+      final (_, repo) = await _makeSetup();
+      expect(await repo.applySieveRules(_account.id), 0);
+    });
+
+    test('returns 0 when script has no matching rules', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["NEVER_MATCHES_XYZ"] {
+  fileinto "Archive";
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        subject: 'Hello world',
+      );
+      expect(await repo.applySieveRules(_account.id), 0);
+    });
+
+    test('applies fileinto rule and queues a move pending change', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["SPAM"] {
+  fileinto "Archive";
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        subject: 'THIS IS SPAM',
+      );
+
+      final count = await repo.applySieveRules(_account.id);
+      expect(count, 1);
+
+      final pending = await db.select(db.pendingChanges).get();
+      expect(pending, hasLength(1));
+      expect(pending.first.changeType, 'move');
+      final payload = jsonDecode(pending.first.payload) as Map<String, dynamic>;
+      expect(payload['dest'], 'Archive');
+    });
+
+    test('applies discard rule and queues a delete pending change', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+if header :contains "from" ["spam@evil.com"] {
+  discard;
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        from: 'spam@evil.com',
+      );
+
+      final count = await repo.applySieveRules(_account.id);
+      expect(count, 1);
+
+      final pending = await db.select(db.pendingChanges).get();
+      expect(pending, hasLength(1));
+      expect(pending.first.changeType, 'delete');
+    });
+
+    test('records email in LocalSieveApplied after processing', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["SPAM"] {
+  fileinto "Archive";
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        subject: 'SPAM email',
+      );
+
+      await repo.applySieveRules(_account.id);
+
+      final applied = await db.select(db.localSieveApplied).get();
+      expect(applied, hasLength(1));
+      expect(applied.first.messageId, '<msg1@test>');
+      expect(applied.first.accountId, _account.id);
+    });
+
+    test('does not reprocess an email already in LocalSieveApplied', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["SPAM"] {
+  fileinto "Archive";
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        subject: 'SPAM email',
+      );
+
+      // First run applies the rule.
+      expect(await repo.applySieveRules(_account.id), 1);
+
+      // Restore the email to INBOX to simulate a re-sync (e.g. second device
+      // moved it back). The LocalSieveApplied record prevents reprocessing.
+      await (db.update(db.emails)..where((t) => t.id.equals('sieve-acc:1')))
+          .write(const EmailsCompanion(mailboxPath: Value('INBOX')));
+
+      // Second run must not produce another pending change.
+      expect(await repo.applySieveRules(_account.id), 0);
+      final pending = await db.select(db.pendingChanges).get();
+      // Only the original move from the first run; no duplicates.
+      expect(pending, hasLength(1));
+    });
+
+    test('skips emails with no messageId', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["SPAM"] {
+  fileinto "Archive";
+}
+''');
+      // Insert without messageId.
+      await db.into(db.emails).insert(
+            EmailsCompanion.insert(
+              id: 'sieve-acc:2',
+              accountId: _account.id,
+              mailboxPath: 'INBOX',
+              uid: 2,
+              subject: const Value('SPAM without id'),
+              receivedAt: DateTime.now(),
+            ),
+          );
+      await db.into(db.threads).insertOnConflictUpdate(
+            ThreadsCompanion.insert(
+              id: 'sieve-acc:2',
+              accountId: _account.id,
+              mailboxPath: 'INBOX',
+              latestDate: DateTime.now(),
+              latestEmailId: 'sieve-acc:2',
+            ),
+          );
+
+      expect(await repo.applySieveRules(_account.id), 0);
+      expect(await db.select(db.pendingChanges).get(), isEmpty);
+    });
+
+    test('emails not in INBOX are ignored', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["SPAM"] {
+  fileinto "Archive";
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        subject: 'SPAM in Sent',
+        mailboxPath: 'Sent',
+      );
+
+      expect(await repo.applySieveRules(_account.id), 0);
+      expect(await db.select(db.pendingChanges).get(), isEmpty);
+    });
+
+    test('processes multiple emails independently', () async {
+      final (db, repo) = await _makeSetup();
+      await _insertSieveScript(db, '''
+require ["fileinto"];
+if header :contains "subject" ["SPAM"] {
+  fileinto "Archive";
+}
+''');
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:1',
+        messageId: '<msg1@test>',
+        subject: 'SPAM',
+      );
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:2',
+        messageId: '<msg2@test>',
+        subject: 'Hello',
+      );
+      await _insertInboxEmail(
+        db,
+        id: 'sieve-acc:3',
+        messageId: '<msg3@test>',
+        subject: 'More SPAM',
+      );
+
+      final count = await repo.applySieveRules(_account.id);
+      expect(count, 2);
+
+      final applied = await db.select(db.localSieveApplied).get();
+      // All three emails should be in LocalSieveApplied.
+      expect(applied, hasLength(3));
+
+      final pending = await db.select(db.pendingChanges).get();
+      expect(pending, hasLength(2));
+    });
+  });
+}

test/unit/cid_utils_test.dart

@@ -0,0 +1,96 @@
+import 'dart:convert';
+
+import 'package:enough_mail/enough_mail.dart' as imap;
+import 'package:flutter_test/flutter_test.dart';
+import 'package:sharedinbox/core/utils/cid_utils.dart';
+
+// A minimal multipart/related email with one embedded PNG referenced via cid:.
+//
+// The image data is the 1×1 red pixel PNG (67 bytes) from RFC-tests tradition.
+const _kPixelPng =
+    'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwADhQGAWjR9awAAAABJRU5ErkJggg==';
+
+// Build a synthetic RFC 2822 multipart/related message.
+String _buildRelatedMime({String cidHost = 'test@example.com'}) {
+  const boundary = '----=_Part_TEST_BOUNDARY';
+  const innerBoundary = '----=_Part_INNER_BOUNDARY';
+  return [
+    'MIME-Version: 1.0',
+    'Content-Type: multipart/related;',
+    '\ttype="multipart/alternative";',
+    '\tboundary="$boundary"',
+    '',
+    '--$boundary',
+    'Content-Type: multipart/alternative;',
+    '\tboundary="$innerBoundary"',
+    '',
+    '--$innerBoundary',
+    'Content-Type: text/plain; charset=UTF-8',
+    '',
+    'See the image below.',
+    '--$innerBoundary',
+    'Content-Type: text/html; charset=UTF-8',
+    '',
+    '<html><body><img src="cid:$cidHost"></body></html>',
+    '--$innerBoundary--',
+    '',
+    '--$boundary',
+    'Content-Type: image/png',
+    'Content-Disposition: inline',
+    'Content-Transfer-Encoding: base64',
+    'Content-ID: <$cidHost>',
+    '',
+    _kPixelPng,
+    '--$boundary--',
+  ].join('\r\n');
+}
+
+void main() {
+  group('injectInlineImages', () {
+    test('replaces cid: reference with data: URI', () {
+      final msg = imap.MimeMessage.parseFromText(_buildRelatedMime());
+      const html = '<img src="cid:test@example.com">';
+
+      final result = injectInlineImages(html, msg);
+
+      expect(result, contains('src="data:image/png;base64,'));
+      expect(result, isNot(contains('cid:')));
+    });
+
+    test('leaves HTML unchanged when there are no inline parts', () {
+      // A plain text-only message.
+      const plainMime = 'MIME-Version: 1.0\r\n'
+          'Content-Type: text/plain\r\n'
+          '\r\n'
+          'Hello';
+      final msg = imap.MimeMessage.parseFromText(plainMime);
+      const html = '<img src="cid:foo@bar">';
+
+      expect(injectInlineImages(html, msg), html);
+    });
+
+    test('handles single-quoted src attribute', () {
+      final msg = imap.MimeMessage.parseFromText(_buildRelatedMime());
+      const html = "<img src='cid:test@example.com'>";
+
+      final result = injectInlineImages(html, msg);
+
+      expect(result, contains("src='data:image/png;base64,"));
+      expect(result, isNot(contains('cid:')));
+    });
+
+    test('embedded data is the same base64 as the MIME part', () {
+      final msg = imap.MimeMessage.parseFromText(_buildRelatedMime());
+      const html = '<img src="cid:test@example.com">';
+
+      final result = injectInlineImages(html, msg);
+
+      // Extract base64 payload from the data URI.
+      final match =
+          RegExp(r'data:image/png;base64,([A-Za-z0-9+/=]+)').firstMatch(result);
+      expect(match, isNotNull);
+      final decoded = base64.decode(match!.group(1)!);
+      expect(decoded.length, greaterThan(0));
+    });
+  });
+}