feat(03-02): rewrite HomeScreen with daily plan UI, completion animation, empty states, and tests

- Complete HomeScreen rewrite: progress card, overdue/today/tomorrow sections
- Animated task completion with SizeTransition + SlideTransition on checkbox tap
- "All clear" celebration state when all tasks done, "no tasks" state for first-run
- Room name tags navigate to room task list via context.go
- 6 widget tests covering empty, all-clear, normal state, overdue, tomorrow sections
- Fixed app_shell_test to override dailyPlanProvider for new HomeScreen dependency

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

test/shell/app_shell_test.dart

@@ -4,6 +4,8 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 import 'package:household_keeper/core/router/router.dart';
+import 'package:household_keeper/features/home/domain/daily_plan_models.dart';
+import 'package:household_keeper/features/home/presentation/daily_plan_providers.dart';
 import 'package:household_keeper/features/rooms/presentation/room_providers.dart';
 import 'package:household_keeper/l10n/app_localizations.dart';
 
@@ -13,7 +15,7 @@ void main() {
       SharedPreferences.setMockInitialValues({});
     });
 
-    /// Helper to build the app with room provider overridden to empty list.
+    /// Helper to build the app with providers overridden for testing.
     Widget buildApp() {
       return ProviderScope(
         overrides: [
@@ -22,6 +24,17 @@ void main() {
           roomWithStatsListProvider.overrideWith(
             (ref) => Stream.value([]),
           ),
+          // Override daily plan to return empty state so HomeScreen
+          // renders without a database.
+          dailyPlanProvider.overrideWith(
+            (ref) => Stream.value(const DailyPlanState(
+              overdueTasks: [],
+              todayTasks: [],
+              tomorrowTasks: [],
+              completedTodayCount: 0,
+              totalTodayCount: 0,
+            )),
+          ),
         ],
         child: MaterialApp.router(
           routerConfig: router,
@@ -52,7 +65,8 @@ void main() {
       await tester.pumpAndSettle();
 
       // Initially on Home tab (index 0) -- verify home empty state is shown
-      expect(find.text('Noch nichts zu tun!'), findsOneWidget);
+      // (dailyPlanNoTasks text from the daily plan empty state)
+      expect(find.text('Noch keine Aufgaben angelegt'), findsOneWidget);
 
       // Tap the Rooms tab (second destination)
       await tester.tap(find.text('R\u00e4ume'));