♻️ Optimize the sfx playing

lib/pods/audio.dart

@@ -0,0 +1,42 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:just_audio/just_audio.dart';
+import 'package:island/pods/config.dart';
+
+final sfxPlayerProvider = Provider<AudioPlayer>((ref) {
+  final player = AudioPlayer();
+  ref.onDispose(() {
+    player.dispose();
+  });
+  return player;
+});
+
+final notificationSfxProvider = FutureProvider<void>((ref) async {
+  final player = ref.watch(sfxPlayerProvider);
+  await player.setVolume(0.75);
+  await player.setAudioSource(
+    AudioSource.asset('assets/audio/notification.mp3'),
+    preload: true,
+  );
+});
+
+final messageSfxProvider = FutureProvider<void>((ref) async {
+  final player = ref.watch(sfxPlayerProvider);
+  await player.setAudioSource(
+    AudioSource.asset('assets/audio/messages.mp3'),
+    preload: true,
+  );
+});
+
+void playNotificationSfx(WidgetRef ref) {
+  final settings = ref.read(appSettingsProvider);
+  if (!settings.soundEffects) return;
+  final player = ref.read(sfxPlayerProvider);
+  player.play();
+}
+
+void playMessageSfx(WidgetRef ref) {
+  final settings = ref.read(appSettingsProvider);
+  if (!settings.soundEffects) return;
+  final player = ref.read(sfxPlayerProvider);
+  player.play();
+}