feat(05-02): build CalendarStrip, CalendarTaskRow, CalendarDayList widgets

- Add totalTaskCount field to CalendarDayState to distinguish first-run from celebration
- Add getTaskCount() to CalendarDao (SELECT COUNT from tasks)
- CalendarStrip: 181-day horizontal scroll with German abbreviations, today highlighting, month boundary labels, scroll-to-today controller
- CalendarTaskRow: task name + room tag chip + checkbox, no relative date, isOverdue coral styling
- CalendarDayList: loading/error/first-run-empty/empty-day/celebration/has-tasks states, overdue section (today only), slide-out completion animation
- Update home_screen_test.dart and app_shell_test.dart to test new calendar providers instead of dailyPlanProvider

test/shell/app_shell_test.dart

@@ -4,8 +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/home/domain/calendar_models.dart';
+import 'package:household_keeper/features/home/presentation/calendar_providers.dart';
 import 'package:household_keeper/features/rooms/presentation/room_providers.dart';
 import 'package:household_keeper/l10n/app_localizations.dart';
 
@@ -15,6 +15,9 @@ void main() {
       SharedPreferences.setMockInitialValues({});
     });
 
+    final now = DateTime.now();
+    final today = DateTime(now.year, now.month, now.day);
+
     /// Helper to build the app with providers overridden for testing.
     ///
     /// Uses [UncontrolledProviderScope] with a [ProviderContainer] to avoid
@@ -26,15 +29,16 @@ 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,
+        // Override selected date to avoid any DB access.
+        selectedDateProvider.overrideWith(SelectedDateNotifier.new),
+        // Override calendar day provider to return empty first-run state so
+        // HomeScreen renders without a database.
+        calendarDayProvider.overrideWith(
+          (ref) => Stream.value(CalendarDayState(
+            selectedDate: today,
+            dayTasks: const [],
+            overdueTasks: const [],
+            totalTaskCount: 0,
           )),
         ),
       ]);
@@ -53,7 +57,8 @@ void main() {
     testWidgets('renders 3 navigation destinations with correct German labels',
         (tester) async {
       await tester.pumpWidget(buildApp());
-      await tester.pumpAndSettle();
+      await tester.pump();
+      await tester.pump(const Duration(milliseconds: 500));
 
       // Verify 3 NavigationDestination widgets are rendered
       expect(find.byType(NavigationDestination), findsNWidgets(3));
@@ -67,22 +72,24 @@ void main() {
     testWidgets('tapping a destination changes the selected tab',
         (tester) async {
       await tester.pumpWidget(buildApp());
-      await tester.pumpAndSettle();
+      await tester.pump();
+      await tester.pump(const Duration(milliseconds: 500));
 
-      // Initially on Home tab (index 0) -- verify home empty state is shown
-      // (dailyPlanNoTasks text from the daily plan empty state)
+      // Initially on Home tab (index 0) -- verify home first-run empty state
       expect(find.text('Noch keine Aufgaben angelegt'), findsOneWidget);
 
       // Tap the Rooms tab (second destination)
       await tester.tap(find.text('R\u00e4ume'));
-      await tester.pumpAndSettle();
+      await tester.pump();
+      await tester.pump(const Duration(milliseconds: 500));
 
       // Verify we see Rooms content now (empty state)
       expect(find.text('Hier ist noch alles leer!'), findsOneWidget);
 
       // Tap the Settings tab (third destination)
       await tester.tap(find.text('Einstellungen'));
-      await tester.pumpAndSettle();
+      await tester.pump();
+      await tester.pump(const Duration(milliseconds: 500));
 
       // Verify we see Settings content now
       expect(find.text('Darstellung'), findsOneWidget);