fix: Android E2E aliceTile race + bundle deploy-android infra

The Android UI integration test failed at tap(aliceTile) with "0 widgets"
even though pumpUntil had just found the tile. On the slow software-rendered
emulator the route-pop animation finalises during pumpUntil's trailing 300 ms
settle, briefly leaving the tile out of the tree. Re-confirm with a second
pumpUntil before the tap.

Bundles the previously uncommitted infra changes that make task deploy-android
run end-to-end inside nix develop: Linux desktop runtime libs + GL software
rendering env in flake.nix, path_provider_android pin to <2.3 to avoid the
libdartjni SIGSEGV, deferred DB-path resolution after WidgetsFlutterBinding,
+iglx for xvfb-run, platform-tools on PATH, and a single pre-commit script
replacing the dart-format / task-check-fast pair.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/pre_commit_check.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Single nix develop session: format first (autofix), then check-fast.
+# Flutter's startup lock prevents true parallelism between dart format and flutter analyze.
+set -uo pipefail
+cd "$(git rev-parse --show-toplevel)" || exit 1
+
+fvm dart format .
+task check-fast