feat: 알림 재예약 개선과 패키지 업그레이드

lib/widgets/subscription_list_widget.dart

@@ -20,10 +20,10 @@ class SubscriptionListWidget extends StatelessWidget {
   final AnimationController fadeController;
 
   const SubscriptionListWidget({
-    Key? key,
+    super.key,
     required this.categorizedSubscriptions,
     required this.fadeController,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -188,9 +188,9 @@ class MultiSliver extends StatelessWidget {
   final List<Widget> children;
 
   const MultiSliver({
-    Key? key,
+    super.key,
     required this.children,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {