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>

integration_test/app_e2e_test.dart

@@ -220,6 +220,10 @@ void main() {
 
       // ── Navigate to mailboxes ──────────────────────────────────────────────
       _log('navigate to mailboxes');
+      // On the slow Android emulator (software rendering), aliceTile can be
+      // briefly absent right after pumpUntil's trailing 300ms settle while the
+      // route-pop animation finalises. Re-confirm it's present before tapping.
+      await pumpUntil(tester, aliceTile, timeout: const Duration(seconds: 5));
       await tester.tap(aliceTile);
       await pumpUntil(tester, find.text('INBOX'));
       _log('mailboxes settled');