visibility toggle for undone todos

lib/pages/dashboard_page.dart

@@ -3,14 +3,27 @@ import 'package:flutter/material.dart';
 import '../widgets/todo_list.dart';
 import 'todo_create_page.dart';
 
-class DashboardPage extends StatelessWidget {
+class DashboardPage extends StatefulWidget {
   const DashboardPage({super.key});
   static const routeName = '/';
 
+  @override
+  State<DashboardPage> createState() => _DashboardPageState();
+}
+
+class _DashboardPageState extends State<DashboardPage> {
+  bool _showDoneTodos = false;
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        actions: [
+          IconButton(
+            onPressed: () => setState(() => _showDoneTodos = !_showDoneTodos),
+            icon: const Icon(Icons.visibility),
+          )
+        ],
+      ),
       floatingActionButton: FloatingActionButton(
         onPressed: () =>
             Navigator.of(context).pushNamed(CreateTodoPage.routeName),
@@ -19,7 +32,7 @@ class DashboardPage extends StatelessWidget {
       body: Center(
         child: SizedBox(
           width: MediaQuery.of(context).size.width * 0.9,
-          child: const TodoList(),
+          child: TodoList(showDoneTodos: _showDoneTodos),
         ),
       ),
     );