feat:更新代办事项存储功能

lib/widgets/todo_widget.dart

@@ -71,7 +71,7 @@ Widget buildTabs({
 
 Widget buildTodoList({
   required List<Todo> todos,
-  required ValueChanged<String> onToggleTodo,
+  required ValueChanged<Todo> onToggleTodo,
   required ValueChanged<Todo> onEditTodo,
 }) {
   return ListView.separated(
@@ -90,7 +90,7 @@ Widget buildTodoList({
 
 Widget _buildTodoItem({
   required Todo todo,
-  required ValueChanged<String> onToggle,
+  required ValueChanged<Todo> onToggle,
   required ValueChanged<Todo> onEdit,
 }) {
   return buildCard(
@@ -100,7 +100,7 @@ Widget _buildTodoItem({
         width: 24,
         child: Checkbox(
           value: todo.isCompleted,
-          onChanged: (value) => onToggle(todo.id.toString()),
+          onChanged: (value) => onToggle(todo),
           materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
         ),
       ),