chore: prepare for weblate

.github/workflows/l10n.yml

@@ -0,0 +1,30 @@
+name: L10n
+
+on:
+  pull_request:
+    paths:
+      - 'lib/l10n/*.arb'
+  push:
+    paths:
+      - 'lib/l10n/*.arb'
+
+jobs:
+  l10n:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+      - run: flutter --version
+      - run: flutter pub get
+      - run: flutter pub run build_runner build --delete-conflicting-outputs
+      - name: Generate localizations
+        run: flutter gen-l10n --arb-dir=lib/l10n --output-dir=lib/l10n --template-arb-file=app_en.arb --output-localization-file=app_localizations.dart
+      - name: Analyze
+        run: flutter analyze
+      - name: Verify ARB descriptions
+        run: dart run tool/verify_arb_descriptions.dart
+      - name: Validate ARB locales and placeholders
+        run: dart run tool/validate_arb_locales.dart
+      # Generated files are ignored; no diff check needed.