大幅変更＆環境バージョンアップ

lib/widgets/permission_handler_screen.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:gifunavi/pages/permission/permission.dart';
+
+class PermissionHandlerScreen extends StatefulWidget {
+  const PermissionHandlerScreen({super.key});
+
+  @override
+  _PermissionHandlerScreenState createState() => _PermissionHandlerScreenState();
+}
+
+class _PermissionHandlerScreenState extends State<PermissionHandlerScreen> {
+  @override
+  void initState() {
+    super.initState();
+
+    WidgetsBinding.instance.addPostFrameCallback((_) async {
+      await PermissionController.checkAndRequestPermissions();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('権限の確認'),
+      ),
+      body: const Center(
+        child: Text('権限の確認中...'),
+      ),
+    );
+  }
+}