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

lib/features/home/data/calendar_dao.dart

@@ -28,7 +28,8 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     ]);
     query.where(
       tasks.nextDueDate.isBiggerOrEqualValue(startOfDay) &
-          tasks.nextDueDate.isSmallerThanValue(endOfDay),
+          tasks.nextDueDate.isSmallerThanValue(endOfDay) &
+          tasks.isActive.equals(true),
     );
     query.orderBy([OrderingTerm.asc(tasks.name)]);
 
@@ -45,12 +46,14 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     });
   }
 
-  /// Returns the total count of tasks across all rooms and dates.
+  /// Returns the total count of active tasks across all rooms and dates.
   ///
   /// Used by the UI to distinguish first-run empty state from celebration state.
   Future<int> getTaskCount() async {
     final countExp = tasks.id.count();
-    final query = selectOnly(tasks)..addColumns([countExp]);
+    final query = selectOnly(tasks)
+      ..addColumns([countExp])
+      ..where(tasks.isActive.equals(true));
     final result = await query.getSingle();
     return result.read(countExp) ?? 0;
   }
@@ -69,7 +72,8 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     query.where(
       tasks.nextDueDate.isBiggerOrEqualValue(startOfDay) &
           tasks.nextDueDate.isSmallerThanValue(endOfDay) &
-          tasks.roomId.equals(roomId),
+          tasks.roomId.equals(roomId) &
+          tasks.isActive.equals(true),
     );
     query.orderBy([OrderingTerm.asc(tasks.name)]);
 
@@ -96,7 +100,10 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     final query = select(tasks).join([
       innerJoin(rooms, rooms.id.equalsExp(tasks.roomId)),
     ]);
-    query.where(tasks.nextDueDate.isSmallerThanValue(startOfReferenceDay));
+    query.where(
+      tasks.nextDueDate.isSmallerThanValue(startOfReferenceDay) &
+          tasks.isActive.equals(true),
+    );
     query.orderBy([OrderingTerm.asc(tasks.nextDueDate)]);
 
     return query.watch().map((rows) {
@@ -128,7 +135,8 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     ]);
     query.where(
       tasks.nextDueDate.isSmallerThanValue(startOfReferenceDay) &
-          tasks.roomId.equals(roomId),
+          tasks.roomId.equals(roomId) &
+          tasks.isActive.equals(true),
     );
     query.orderBy([OrderingTerm.asc(tasks.nextDueDate)]);
 
@@ -145,7 +153,7 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     });
   }
 
-  /// Total task count within a specific room.
+  /// Total active task count within a specific room.
   ///
   /// Used to distinguish first-run empty state from celebration state
   /// in the room calendar view.
@@ -153,7 +161,7 @@ class CalendarDao extends DatabaseAccessor<AppDatabase>
     final countExp = tasks.id.count();
     final query = selectOnly(tasks)
       ..addColumns([countExp])
-      ..where(tasks.roomId.equals(roomId));
+      ..where(tasks.roomId.equals(roomId) & tasks.isActive.equals(true));
     final result = await query.getSingle();
     return result.read(countExp) ?? 0;
   }