feat(05-01): implement CalendarDao with date-parameterized task queries

- CalendarDao.watchTasksForDate: returns tasks due on a specific calendar day, sorted by name
- CalendarDao.watchOverdueTasks: returns tasks due strictly before reference date, sorted by due date
- Registered CalendarDao in AppDatabase @DriftDatabase annotation
- Generated calendar_dao.g.dart and updated database.g.dart

lib/features/home/data/calendar_dao.g.dart

@@ -0,0 +1,25 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'calendar_dao.dart';
+
+// ignore_for_file: type=lint
+mixin _$CalendarDaoMixin on DatabaseAccessor<AppDatabase> {
+  $RoomsTable get rooms => attachedDatabase.rooms;
+  $TasksTable get tasks => attachedDatabase.tasks;
+  $TaskCompletionsTable get taskCompletions => attachedDatabase.taskCompletions;
+  CalendarDaoManager get managers => CalendarDaoManager(this);
+}
+
+class CalendarDaoManager {
+  final _$CalendarDaoMixin _db;
+  CalendarDaoManager(this._db);
+  $$RoomsTableTableManager get rooms =>
+      $$RoomsTableTableManager(_db.attachedDatabase, _db.rooms);
+  $$TasksTableTableManager get tasks =>
+      $$TasksTableTableManager(_db.attachedDatabase, _db.tasks);
+  $$TaskCompletionsTableTableManager get taskCompletions =>
+      $$TaskCompletionsTableTableManager(
+        _db.attachedDatabase,
+        _db.taskCompletions,
+      );
+}