feat(08-01): add isActive filters to CalendarDao, DailyPlanDao, RoomsDao

- CalendarDao: filter all 6 task queries (watchTasksForDate,
  watchTasksForDateInRoom, watchOverdueTasks, watchOverdueTasksInRoom,
  getTaskCount, getTaskCountInRoom) by isActive=true
- DailyPlanDao: filter all 3 queries (watchAllTasksWithRoomName,
  getOverdueAndTodayTaskCount, getOverdueTaskCount) by isActive=true
- RoomsDao: filter watchRoomWithStats task query by isActive=true
- Update migration test: add schema_v3.dart, test v1->v3 and v2->v3 paths
- Update database_test schemaVersion assertion to expect 3
- Fix test helpers in home_screen_test and task_list_screen_test to pass isActive=true

test/drift/household_keeper/generated/schema.dart

@@ -6,6 +6,7 @@ import 'package:drift/drift.dart';
 import 'package:drift/internal/migrations.dart';
 import 'schema_v1.dart' as v1;
 import 'schema_v2.dart' as v2;
+import 'schema_v3.dart' as v3;
 
 class GeneratedHelper implements SchemaInstantiationHelper {
   @override
@@ -15,10 +16,12 @@ class GeneratedHelper implements SchemaInstantiationHelper {
         return v1.DatabaseAtV1(db);
       case 2:
         return v2.DatabaseAtV2(db);
+      case 3:
+        return v3.DatabaseAtV3(db);
       default:
         throw MissingSchemaException(version, versions);
     }
   }
 
-  static const versions = const [1, 2];
+  static const versions = const [1, 2, 3];
 }