🎨 Use feature based folder structure

lib/core/audio.dart

@@ -0,0 +1,65 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:just_audio/just_audio.dart';
+import 'package:island/core/config.dart';
+import 'package:audio_session/audio_session.dart';
+
+final sfxPlayerProvider = Provider<AudioPlayer>((ref) {
+  final player = AudioPlayer();
+  ref.onDispose(() {
+    player.dispose();
+  });
+  return player;
+});
+
+Future<void> _configureAudioSession() async {
+  final session = await AudioSession.instance;
+  await session.configure(
+    const AudioSessionConfiguration(
+      avAudioSessionCategory: AVAudioSessionCategory.playback,
+      avAudioSessionCategoryOptions:
+          AVAudioSessionCategoryOptions.mixWithOthers,
+    ),
+  );
+  await session.setActive(true);
+}
+
+final audioSessionProvider = FutureProvider<void>((ref) async {
+  await _configureAudioSession();
+});
+
+final notificationSfxProvider = FutureProvider<void>((ref) async {
+  final player = ref.watch(sfxPlayerProvider);
+  await player.setVolume(0.75);
+  await player.setAudioSource(
+    AudioSource.asset('assets/audio/notification.wav'),
+    preload: true,
+  );
+});
+
+final messageSfxProvider = FutureProvider<void>((ref) async {
+  final player = ref.watch(sfxPlayerProvider);
+  await player.setAudioSource(
+    AudioSource.asset('assets/audio/messages.wav'),
+    preload: true,
+  );
+});
+
+Future<void> _playSfx(String assetPath, double volume) async {
+  final player = AudioPlayer();
+  await player.setVolume(volume);
+  await player.setAudioSource(AudioSource.asset(assetPath));
+  await player.play();
+  await player.dispose();
+}
+
+void playNotificationSfx(WidgetRef ref) {
+  final settings = ref.read(appSettingsProvider);
+  if (!settings.soundEffects) return;
+  _playSfx('assets/audio/notification.mp3', 0.75);
+}
+
+void playMessageSfx(WidgetRef ref) {
+  final settings = ref.read(appSettingsProvider);
+  if (!settings.soundEffects) return;
+  _playSfx('assets/audio/messages.mp3', 0.75);
+}