Multiple changes:

- Split up UI into several files
- Handle connection state better
- Add images
- Granular rebuilding of state dependent widgets
- Fix usage of alert dialogs
- Add some basic theming
- Add dialog for adding multiple links at once

lib/main.dart

@@ -1,9 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
+import 'player_ui/main.dart';
 import 'state/connection_state_bloc.dart';
 import 'state/player_state_bloc.dart';
-import 'player_ui.dart';
 
 void main() => runApp(const MyApp());
 
@@ -18,13 +18,22 @@ class MyApp extends StatelessWidget {
 
     return MaterialApp(
       title: 'Gergle',
+      theme: ThemeData(
+        useMaterial3: true,
+
+        // primaryColor: const Color(0x002244FF),
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: Colors.lightBlue,
+          brightness: Brightness.dark,
+        ),
+      ),
       home: MultiBlocProvider(
         providers: [
           BlocProvider(create: (_) => connectionStateBloc),
           BlocProvider(create: (_) => playerStateBloc),
         ],
-        child: PlayerUi(),
+        child: const PlayerUi(),
       ),
     );
   }
-}
+}