Advanced chat management via UI

frontend/lib/app_menu.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'agent_list_screen.dart';
 import 'chat_list_screen.dart';
 import 'user_checker.dart';
 import 'backend.dart';
@@ -13,6 +14,17 @@ class AppMenu extends StatelessWidget {
       appBar: AppBar(title: const Text('Menu')),
       body: ListView(
         children: <Widget>[
+          ListTile(
+            title: const Text('Agents'),
+            onTap: () {
+              Navigator.push(
+                context,
+                MaterialPageRoute(
+                  builder: (context) => const AgentListScreen(),
+                ),
+              );
+            },
+          ),
           ListTile(
             title: const Text('Chats'),
             onTap: () {