feat:增加代办事项状态管理

lib/main.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import 'layout/main_screen.dart';
+import 'store/todo_dialog_store.dart';
 
 void main() {
   runApp(const MyApp());
@@ -13,8 +14,11 @@ class MyApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ChangeNotifierProvider(
-      create: (context) => AppProvider(),
+    return MultiProvider(
+      providers: [
+        ChangeNotifierProvider(create: (_) => AppProvider()),
+        ChangeNotifierProvider(create: (_) => TodoDialogStore()), // 新增
+      ],
       child: MaterialApp(
         title: '闪灵',
         theme: ThemeData(