feat: Add Audio Gallery screen and integrate into Debug Tools menu

feat: Implement audio playback controls and audio management in the gallery
refactor: Update audio engine interface to include stopAllAudio method

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

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

@@ -6,6 +6,7 @@ abstract class EngineAudio {
   void playMenuMusic();
   void playLevelMusic(WolfLevel level);
   void stopMusic();
+  Future<void> stopAllAudio();
   void playSoundEffect(int sfxId);
   Future<void> init();
   void dispose();

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

@@ -22,6 +22,9 @@ class CliSilentAudio implements EngineAudio {
   @override
   void stopMusic() {}
 
+  @override
+  Future<void> stopAllAudio() async {}
+
   @override
   void playSoundEffect(int sfxId) {
     // Optional: You could use the terminal 'bell' character here

packages/wolf_3d_dart/lib/src/synth/wolf_3d_audio.dart

@@ -62,7 +62,7 @@ class WolfAudio implements EngineAudio {
   /// Disposes of the audio engine and frees resources.
   @override
   void dispose() {
-    stopMusic();
+    stopAllAudio();
     _musicPlayer.dispose();
 
     for (final player in _sfxPlayers) {
@@ -101,6 +101,16 @@ class WolfAudio implements EngineAudio {
     await _musicPlayer.stop();
   }
 
+  @override
+  Future<void> stopAllAudio() async {
+    if (!_isInitialized) return;
+
+    await _musicPlayer.stop();
+    for (final player in _sfxPlayers) {
+      await player.stop();
+    }
+  }
+
   Future<void> pauseMusic() async {
     if (_isInitialized) await _musicPlayer.pause();
   }