Functioning music player features

Co-authored-by: Copilot <copilot@github.com>

lib/streaming_audio_business_object.dart

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+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:just_audio/just_audio.dart';
+
+class StreamingAudioBusinessObject extends ChangeNotifier {
+  StreamingAudioBusinessObject({
+    this.streamUrl = 'https://kryz.out.airtime.pro/kryz_a',
+  }) {
+    _playerStateSubscription = _player.playerStateStream.listen((state) {
+      final isCurrentlyPlaying =
+          state.playing && state.processingState != ProcessingState.completed;
+
+      if (_isPlaying != isCurrentlyPlaying) {
+        _isPlaying = isCurrentlyPlaying;
+        notifyListeners();
+      }
+    });
+  }
+
+  final String streamUrl;
+  final AudioPlayer _player = AudioPlayer();
+  late final StreamSubscription<PlayerState> _playerStateSubscription;
+  bool _isSourceLoaded = false;
+  bool _isPlaying = false;
+
+  bool get isPlaying => _isPlaying;
+
+  Future<void> play() async {
+    if (!_isSourceLoaded) {
+      await _player.setUrl(streamUrl);
+      _isSourceLoaded = true;
+    }
+
+    await _player.play();
+  }
+
+  Future<void> pause() async {
+    await _player.pause();
+  }
+
+  @override
+  void dispose() {
+    _playerStateSubscription.cancel();
+    _player.dispose();
+    super.dispose();
+  }
+}