Fix admin icon UI and lockfile

flutter_app/lib/screens/admin/admin_screen.dart

@@ -1,5 +1,4 @@
 import 'dart:typed_data';
-import 'dart:typed_data';
 
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';

flutter_app/lib/screens/tv/tv_dashboard_screen.dart

@@ -67,7 +67,20 @@ class _TvDashboardScreenState extends State<TvDashboardScreen> {
                         mainAxisAlignment: MainAxisAlignment.spaceBetween,
                         children: [
                           const DigitalClockWidget(),
-                          const WeatherWidget()
+                          Row(
+                            mainAxisSize: MainAxisSize.min,
+                            children: [
+                              const WeatherWidget(),
+                              const SizedBox(width: 16),
+                              IconButton(
+                                icon: const Icon(Icons.settings,
+                                    color: Colors.white70),
+                                onPressed: () {
+                                  Navigator.of(context).pushNamed('/admin');
+                                },
+                              ),
+                            ],
+                          )
                         ],
                       ),
                     ),