refactoring

lib/pages/todo_detail_page.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/material.dart';
+
+class TodoDetailPage extends StatelessWidget {
+  const TodoDetailPage({super.key});
+  static const routeName = '/detail';
+
+  @override
+  Widget build(BuildContext context) {
+    return const Placeholder();
+  }
+}