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/test/engine/audio_events_test.dart

@@ -181,6 +181,9 @@ class _CapturingAudio implements EngineAudio {
   @override
   void stopMusic() {}
 
+  @override
+  Future<void> stopAllAudio() async {}
+
   @override
   void dispose() {}
 }

packages/wolf_3d_dart/test/engine/enemy_drop_parity_test.dart

@@ -130,6 +130,9 @@ class _SilentAudio implements EngineAudio {
   @override
   void stopMusic() {}
 
+  @override
+  Future<void> stopAllAudio() async {}
+
   @override
   void dispose() {}
 }

packages/wolf_3d_dart/test/engine/level_state_and_pause_menu_test.dart

@@ -407,6 +407,9 @@ class _SilentAudio implements EngineAudio {
   @override
   void stopMusic() {}
 
+  @override
+  Future<void> stopAllAudio() async {}
+
   @override
   void dispose() {}
 }