feat: 알림 재예약 개선과 패키지 업그레이드

lib/screens/add_subscription_screen.dart

@@ -9,7 +9,7 @@ import '../widgets/add_subscription/add_subscription_save_button.dart';
 
 /// 새로운 구독을 추가하는 화면
 class AddSubscriptionScreen extends StatefulWidget {
-  const AddSubscriptionScreen({Key? key}) : super(key: key);
+  const AddSubscriptionScreen({super.key});
 
   @override
   State<AddSubscriptionScreen> createState() => _AddSubscriptionScreenState();