fix: override accountConnectionStatusProvider in E2E test to prevent spinner deadlock

CircularProgressIndicator in _AccountTile (from accountConnectionStatusProvider)
runs continuously and prevents pumpAndSettle() from ever settling on Android,
causing frame-pump storms that drop the StreamBuilder data state and make
tap(aliceTile) find 0 widgets.

Overriding the provider to return immediately means no spinner ever enters the
tree, so pumpUntil() can use pumpAndSettle() cleanly again.

Also adds task run-android (boots sharedinbox_test AVD and runs flutter run).

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

stalwart-dev/run_android.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# Boot the sharedinbox_test AVD if no emulator is running, then launch the app
+# interactively with flutter run.
+#
+# Run inside nix develop:
+#   stalwart-dev/run_android.sh
+set -Eeuo pipefail
+
+ADB=$(command -v adb 2>/dev/null || echo "${ANDROID_HOME:-$HOME/Android/Sdk}/platform-tools/adb")
+"$ADB" version >/dev/null 2>&1 || {
+    echo "adb not found — set ANDROID_HOME or add platform-tools to PATH"
+    exit 1
+}
+
+EMULATOR_ID=$("$ADB" devices | awk '/^emulator-[0-9]+[[:space:]]+device$/ {print $1; exit}')
+if [ -z "$EMULATOR_ID" ]; then
+    EMULATOR_BIN="${ANDROID_HOME:-$HOME/Android/Sdk}/emulator/emulator"
+    echo "No emulator running — booting AVD sharedinbox_test..."
+    "$EMULATOR_BIN" -avd sharedinbox_test -no-audio -no-snapshot-save &
+    for _i in $(seq 1 60); do
+        EMULATOR_ID=$("$ADB" devices | awk '/^emulator-[0-9]+[[:space:]]+device$/ {print $1; exit}')
+        [ -n "$EMULATOR_ID" ] && break
+        sleep 2
+    done
+    [ -n "$EMULATOR_ID" ] || { echo "Emulator did not become ready within 120 s"; exit 1; }
+    "$ADB" -s "$EMULATOR_ID" wait-for-device
+    for _i in $(seq 1 30); do
+        BOOT_DONE=$("$ADB" -s "$EMULATOR_ID" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r')
+        [ "$BOOT_DONE" = "1" ] && break
+        sleep 2
+    done
+    [ "${BOOT_DONE:-0}" = "1" ] || { echo "Android boot did not complete within 60 s"; exit 1; }
+fi
+
+echo "Using emulator: $EMULATOR_ID"
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$ROOT"
+fvm flutter run -d "$EMULATOR_ID" --no-pub