feat: Enhance audio management by implementing shutdown procedures on exit

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_dart/lib/src/engine/audio/native_subprocess_audio_io.dart

@@ -21,6 +21,7 @@ class NativeSubprocessAudio implements EngineAudio, DebugMusicPlayer {
 
   bool _initialized = false;
   bool _isSupported = false;
+  bool _disposed = false;
   _AudioBackend _backend = _AudioBackend.none;
   String _windowsShellCommand = 'powershell';
 
@@ -32,7 +33,7 @@ class NativeSubprocessAudio implements EngineAudio, DebugMusicPlayer {
 
   @override
   Future<void> init() async {
-    if (_initialized) {
+    if (_initialized || _disposed) {
       return;
     }
 
@@ -49,7 +50,25 @@ class NativeSubprocessAudio implements EngineAudio, DebugMusicPlayer {
 
   @override
   void dispose() {
-    unawaited(stopAllAudio());
+    if (_disposed) {
+      return;
+    }
+    _disposed = true;
+
+    _musicLoopToken++;
+    _musicProcess?.kill();
+    _musicProcess = null;
+
+    for (final process in List<Process>.from(_sfxProcesses)) {
+      process.kill();
+    }
+    _sfxProcesses.clear();
+
+    final path = _musicTempFilePath;
+    _musicTempFilePath = null;
+    if (path != null) {
+      unawaited(_cleanupTempWav(path));
+    }
   }
 
   @override