feat(02-04): wire template selection flow into room creation

- After createRoom, detect room type via detectRoomType on room name
- Show TemplatePickerSheet if room type matches one of 14 known types
- Create tasks from selected templates with correct frequency, effort, and anchor day
- Navigate to new room after creation (with or without templates)
- Edit mode unchanged: no template prompt on room updates
- Custom rooms (no type match) skip template prompt entirely

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

lib/features/rooms/presentation/room_form_screen.dart

@@ -6,6 +6,10 @@ import 'package:household_keeper/core/providers/database_provider.dart';
 import 'package:household_keeper/features/rooms/domain/room_icons.dart';
 import 'package:household_keeper/features/rooms/presentation/icon_picker_sheet.dart';
 import 'package:household_keeper/features/rooms/presentation/room_providers.dart';
+import 'package:household_keeper/features/tasks/domain/frequency.dart';
+import 'package:household_keeper/features/tasks/presentation/task_providers.dart';
+import 'package:household_keeper/features/templates/data/task_templates.dart';
+import 'package:household_keeper/features/templates/presentation/template_picker_sheet.dart';
 import 'package:household_keeper/l10n/app_localizations.dart';
 
 /// Full-screen form for creating and editing rooms.
@@ -62,21 +66,40 @@ class _RoomFormScreenState extends ConsumerState<RoomFormScreen> {
     setState(() => _isSaving = true);
 
     try {
-      final actions = ref.read(roomActionsProvider.notifier);
+      final roomActions = ref.read(roomActionsProvider.notifier);
+      final name = _nameController.text.trim();
+
       if (widget.isEditing) {
+        // Edit mode: update and pop (no template prompt).
         final db = ref.read(appDatabaseProvider);
         final existing = await db.roomsDao.getRoomById(widget.roomId!);
-        await actions.updateRoom(existing.copyWith(
-          name: _nameController.text.trim(),
+        await roomActions.updateRoom(existing.copyWith(
+          name: name,
           iconName: _selectedIconName,
         ));
-      } else {
-        await actions.createRoom(
-          _nameController.text.trim(),
-          _selectedIconName,
-        );
-      }
         if (mounted) context.pop();
+      } else {
+        // Create mode: save room, then offer template selection if type matches.
+        final roomId = await roomActions.createRoom(name, _selectedIconName);
+        if (!mounted) return;
+
+        final roomType = detectRoomType(name);
+        if (roomType != null) {
+          final templates = roomTemplates[roomType];
+          if (templates != null && templates.isNotEmpty) {
+            final selected = await showTemplatePickerSheet(
+              context: context,
+              roomType: roomType,
+              templates: templates,
+            );
+            if (selected != null && selected.isNotEmpty && mounted) {
+              await _createTasksFromTemplates(roomId, selected);
+            }
+          }
+        }
+
+        if (mounted) context.go('/rooms/$roomId');
+      }
     } catch (e) {
       if (mounted) {
         setState(() => _isSaving = false);
@@ -87,6 +110,48 @@ class _RoomFormScreenState extends ConsumerState<RoomFormScreen> {
     }
   }
 
+  /// Creates tasks from the selected templates in the newly created room.
+  Future<void> _createTasksFromTemplates(
+    int roomId,
+    List<TaskTemplate> templates,
+  ) async {
+    final taskActions = ref.read(taskActionsProvider.notifier);
+    final today = DateTime.now();
+    final todayDateOnly = DateTime(today.year, today.month, today.day);
+
+    for (final template in templates) {
+      await taskActions.createTask(
+        roomId: roomId,
+        name: template.name,
+        description: template.description,
+        intervalType: template.intervalType,
+        intervalDays: template.intervalDays,
+        anchorDay: _anchorDayForType(template.intervalType, todayDateOnly),
+        effortLevel: template.effortLevel,
+        nextDueDate: todayDateOnly,
+      );
+    }
+  }
+
+  /// Returns the anchor day for calendar-anchored interval types.
+  ///
+  /// Monthly/quarterly/yearly intervals anchor to today's day-of-month.
+  /// Day-count based intervals don't need an anchor.
+  int? _anchorDayForType(IntervalType type, DateTime today) {
+    switch (type) {
+      case IntervalType.monthly:
+      case IntervalType.everyNMonths:
+      case IntervalType.quarterly:
+      case IntervalType.yearly:
+        return today.day;
+      case IntervalType.daily:
+      case IntervalType.everyNDays:
+      case IntervalType.weekly:
+      case IntervalType.biweekly:
+        return null;
+    }
+  }
+
   @override
   void dispose() {
     _nameController.dispose();