more cleanup and small fixes, new sound effects

lib/src/screens/vocab_screen.dart

@@ -45,8 +45,9 @@ class _VocabScreenState extends State<VocabScreen>
   final _quizStates = [_QuizState(), _QuizState(), _QuizState()];
   _QuizState get _currentQuizState => _quizStates[_tabController.index];
 
-  bool _playAudio = true;
+  bool _playIncorrectSound = true;
   bool _playCorrectSound = true;
+  bool _playNarrator = true;
   bool _apiKeyMissing = false;
 
   @override
@@ -72,8 +73,9 @@ class _VocabScreenState extends State<VocabScreen>
   Future<void> _loadSettings() async {
     final prefs = await SharedPreferences.getInstance();
     setState(() {
-      _playAudio = prefs.getBool('playAudio') ?? true;
+      _playIncorrectSound = prefs.getBool('playIncorrectSound') ?? true;
       _playCorrectSound = prefs.getBool('playCorrectSound') ?? true;
+      _playNarrator = prefs.getBool('playNarrator') ?? true;
     });
   }
 
@@ -222,7 +224,7 @@ class _VocabScreenState extends State<VocabScreen>
     final current = _currentQuizState.current;
     if (current == null || current.pronunciationAudios.isEmpty) return;
 
-    if (playOnLoad && !_playAudio) return;
+    if (playOnLoad && !_playNarrator) return;
 
     final maleAudios = current.pronunciationAudios.where(
       (a) => a.gender == 'male',
@@ -263,6 +265,9 @@ class _VocabScreenState extends State<VocabScreen>
       srsItem.srsStage += 1;
     } else {
       srsItem.srsStage = max(0, srsItem.srsStage - 1);
+      if (_playIncorrectSound) {
+        await _audioPlayer.play(AssetSource('sfx/incorrect.wav'));
+      }
     }
     srsItem.lastAsked = DateTime.now();
     current.srsItems[srsKey] = srsItem;
@@ -294,10 +299,9 @@ class _VocabScreenState extends State<VocabScreen>
     ScaffoldMessenger.of(context).showSnackBar(snack);
 
     if (isCorrect) {
-      if (_playCorrectSound) {
-        await _audioPlayer.play(AssetSource('sfx/confirm.mp3'));
-      }
-      if (_playAudio) {
+      if (_playCorrectSound && !_playNarrator) {
+        await _audioPlayer.play(AssetSource('sfx/correct.wav'));
+      } else if (_playNarrator) {
         final maleAudios = current.pronunciationAudios.where(
           (a) => a.gender == 'male',
         );