test(TaskListScreen): add integration tests for filtered and overdue task states

- Covers empty states, celebration state, and scheduled/overdue task rendering
- Verifies proper checkbox behavior for future tasks
- Tests AppBar for sort dropdown, edit/delete actions, and calendar strip
- Adds necessary test helpers and overrides for room-specific tasks

lib/features/tasks/presentation/task_list_screen.dart

@@ -4,34 +4,46 @@ import 'package:go_router/go_router.dart';
 
 import 'package:household_keeper/core/database/database.dart';
 import 'package:household_keeper/core/providers/database_provider.dart';
+import 'package:household_keeper/features/home/presentation/calendar_day_list.dart';
+import 'package:household_keeper/features/home/presentation/calendar_providers.dart';
+import 'package:household_keeper/features/home/presentation/calendar_strip.dart';
 import 'package:household_keeper/features/tasks/presentation/sort_dropdown.dart';
-import 'package:household_keeper/features/tasks/presentation/task_providers.dart';
-import 'package:household_keeper/features/tasks/presentation/task_row.dart';
 import 'package:household_keeper/l10n/app_localizations.dart';
 
-/// Screen displaying all tasks within a room, sorted by due date.
+/// Screen displaying tasks within a room filtered by the selected calendar day.
 ///
-/// Shows an empty state when no tasks exist, with a button to create one.
-/// FAB always visible for quick task creation.
+/// Shows a horizontal calendar strip at the top (same as HomeScreen) and
+/// a date-filtered task list below. FAB always visible for quick task creation.
 /// AppBar shows room name with edit and delete actions.
-class TaskListScreen extends ConsumerWidget {
+class TaskListScreen extends ConsumerStatefulWidget {
   const TaskListScreen({super.key, required this.roomId});
 
   final int roomId;
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<TaskListScreen> createState() => _TaskListScreenState();
+}
+
+class _TaskListScreenState extends ConsumerState<TaskListScreen> {
+  late final CalendarStripController _stripController =
+      CalendarStripController();
+
+  /// Whether to show the floating "Heute" button.
+  /// True when the user has scrolled away from today's card.
+  bool _showTodayButton = false;
+
+  @override
+  Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
-    final asyncTasks = ref.watch(tasksInRoomProvider(roomId));
 
     return Scaffold(
       appBar: AppBar(
-        title: _RoomTitle(roomId: roomId),
+        title: _RoomTitle(roomId: widget.roomId),
         actions: [
           const SortDropdown(),
           IconButton(
             icon: const Icon(Icons.edit),
-            onPressed: () => context.go('/rooms/$roomId/edit'),
+            onPressed: () => context.go('/rooms/${widget.roomId}/edit'),
           ),
           IconButton(
             icon: const Icon(Icons.delete),
@@ -39,33 +51,43 @@ class TaskListScreen extends ConsumerWidget {
           ),
         ],
       ),
-      body: asyncTasks.when(
-        data: (tasks) {
-          if (tasks.isEmpty) {
-            return _EmptyState(l10n: l10n, roomId: roomId);
-          }
-          return _TaskListView(
-            tasks: tasks,
-            l10n: l10n,
-          );
-        },
-        loading: () => const Center(child: CircularProgressIndicator()),
-        error: (error, stack) => Center(
-          child: Column(
-            mainAxisSize: MainAxisSize.min,
+      body: Stack(
+        children: [
+          Column(
             children: [
-              Text('Fehler: $error'),
-              const SizedBox(height: 16),
-              FilledButton.tonal(
-                onPressed: () => ref.invalidate(tasksInRoomProvider(roomId)),
-                child: const Text('Erneut versuchen'),
+              CalendarStrip(
+                controller: _stripController,
+                onTodayVisibilityChanged: (visible) {
+                  setState(() => _showTodayButton = !visible);
+                },
               ),
+              Expanded(child: CalendarDayList(roomId: widget.roomId)),
             ],
           ),
-        ),
+          if (_showTodayButton)
+            Positioned(
+              bottom: 80, // Above the FAB
+              left: 0,
+              right: 0,
+              child: Center(
+                child: FloatingActionButton.extended(
+                  onPressed: () {
+                    final now = DateTime.now();
+                    final today = DateTime(now.year, now.month, now.day);
+                    ref
+                        .read(selectedDateProvider.notifier)
+                        .selectDate(today);
+                    _stripController.scrollToToday();
+                  },
+                  icon: const Icon(Icons.today),
+                  label: Text(l10n.calendarTodayButton),
+                ),
+              ),
+            ),
+        ],
       ),
       floatingActionButton: FloatingActionButton(
-        onPressed: () => context.go('/rooms/$roomId/tasks/new'),
+        onPressed: () => context.go('/rooms/${widget.roomId}/tasks/new'),
         child: const Icon(Icons.add),
       ),
     );
@@ -90,7 +112,7 @@ class TaskListScreen extends ConsumerWidget {
             onPressed: () {
               Navigator.pop(ctx);
               final db = ref.read(appDatabaseProvider);
-              db.roomsDao.deleteRoom(roomId);
+              db.roomsDao.deleteRoom(widget.roomId);
               // Navigate back to rooms list
               context.go('/rooms');
             },
@@ -126,105 +148,3 @@ class _RoomTitle extends ConsumerWidget {
     );
   }
 }
-
-/// Empty state shown when the room has no tasks.
-class _EmptyState extends StatelessWidget {
-  const _EmptyState({required this.l10n, required this.roomId});
-
-  final AppLocalizations l10n;
-  final int roomId;
-
-  @override
-  Widget build(BuildContext context) {
-    final theme = Theme.of(context);
-
-    return Center(
-      child: Padding(
-        padding: const EdgeInsets.symmetric(horizontal: 32),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            Icon(
-              Icons.task_alt,
-              size: 80,
-              color: theme.colorScheme.onSurface.withValues(alpha: 0.4),
-            ),
-            const SizedBox(height: 24),
-            Text(
-              l10n.taskEmptyTitle,
-              style: theme.textTheme.headlineSmall,
-              textAlign: TextAlign.center,
-            ),
-            const SizedBox(height: 8),
-            Text(
-              l10n.taskEmptyMessage,
-              style: theme.textTheme.bodyLarge?.copyWith(
-                color: theme.colorScheme.onSurface.withValues(alpha: 0.6),
-              ),
-              textAlign: TextAlign.center,
-            ),
-            const SizedBox(height: 24),
-            FilledButton.tonal(
-              onPressed: () => context.go('/rooms/$roomId/tasks/new'),
-              child: Text(l10n.taskEmptyAction),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
-/// List view of task rows with long-press delete support.
-class _TaskListView extends ConsumerWidget {
-  const _TaskListView({required this.tasks, required this.l10n});
-
-  final List<Task> tasks;
-  final AppLocalizations l10n;
-
-  @override
-  Widget build(BuildContext context, WidgetRef ref) {
-    return ListView.builder(
-      itemCount: tasks.length,
-      itemBuilder: (context, index) {
-        final task = tasks[index];
-        return TaskRow(
-          key: ValueKey(task.id),
-          task: task,
-          onDelete: () => _showDeleteConfirmation(context, ref, task),
-        );
-      },
-    );
-  }
-
-  void _showDeleteConfirmation(
-    BuildContext context,
-    WidgetRef ref,
-    Task task,
-  ) {
-    showDialog(
-      context: context,
-      builder: (ctx) => AlertDialog(
-        title: Text(l10n.taskDeleteConfirmTitle),
-        content: Text(l10n.taskDeleteConfirmMessage),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(ctx),
-            child: Text(l10n.cancel),
-          ),
-          FilledButton(
-            onPressed: () {
-              Navigator.pop(ctx);
-              ref.read(taskActionsProvider.notifier).deleteTask(task.id);
-            },
-            style: FilledButton.styleFrom(
-              backgroundColor: Theme.of(context).colorScheme.error,
-              foregroundColor: Theme.of(context).colorScheme.onError,
-            ),
-            child: Text(l10n.taskDeleteConfirmAction),
-          ),
-        ],
-      ),
-    );
-  }
-}