added settings to toggle the audio

lib/src/screens/vocab_screen.dart

@@ -1,6 +1,8 @@
+import 'dart:async';
 import 'dart:math';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import '../models/kanji_item.dart';
 import '../services/deck_repository.dart';
 import '../services/distractor_generator.dart';
@@ -29,13 +31,24 @@ class _VocabScreenState extends State<VocabScreen> {
   List<String> _correctAnswers = [];
   int _score = 0;
   int _asked = 0;
+  bool _playAudio = true;
+  bool _playCorrectSound = true;
 
   @override
   void initState() {
     super.initState();
+    _loadSettings();
     _loadDeck();
   }
 
+  Future<void> _loadSettings() async {
+    final prefs = await SharedPreferences.getInstance();
+    setState(() {
+      _playAudio = prefs.getBool('playAudio') ?? true;
+      _playCorrectSound = prefs.getBool('playCorrectSound') ?? true;
+    });
+  }
+
   Future<void> _loadDeck() async {
     setState(() {
       _loading = true;
@@ -184,17 +197,28 @@ class _VocabScreenState extends State<VocabScreen> {
     }
 
     if (isCorrect) {
-      await _audioPlayer.play(AssetSource('sfx/confirm.mp3'));
-      final maleAudios =
-          current.pronunciationAudios.where((a) => a.gender == 'male');
-      if (maleAudios.isNotEmpty) {
-        try {
-          await _audioPlayer.play(UrlSource(maleAudios.first.url));
-        } catch (e) {
-          // Ignore player errors
+      if (_playCorrectSound) {
+        await _audioPlayer.play(AssetSource('sfx/confirm.mp3'));
+      }
+      if (_playAudio) {
+        final maleAudios =
+            current.pronunciationAudios.where((a) => a.gender == 'male');
+        if (maleAudios.isNotEmpty) {
+          final completer = Completer<void>();
+          final sub = _audioPlayer.onPlayerComplete.listen((event) {
+            if (!completer.isCompleted) completer.complete();
+          });
+
+          try {
+            await _audioPlayer.play(UrlSource(maleAudios.first.url));
+            await completer.future.timeout(const Duration(seconds: 5));
+          } catch (e) {
+            // Ignore player errors
+          } finally {
+            await sub.cancel();
+          }
         }
       }
-      await Future.delayed(const Duration(milliseconds: 400));
     } else {
       await Future.delayed(const Duration(milliseconds: 900));
     }
@@ -225,10 +249,11 @@ class _VocabScreenState extends State<VocabScreen> {
         actions: [
           IconButton(
             icon: const Icon(Icons.settings),
-            onPressed: () {
-              Navigator.of(context).push(
+            onPressed: () async {
+              await Navigator.of(context).push(
                 MaterialPageRoute(builder: (_) => const SettingsScreen()),
               );
+              _loadSettings();
             },
           )
         ],