feat: Refactor to use Wolf3dFlutterEngine across the application

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

packages/wolf_3d_flutter/lib/screens/audio_gallery.dart

@@ -24,7 +24,7 @@ class _AudioRow {
 /// Displays all decoded SFX and music tracks for the selected game data.
 class AudioGallery extends StatefulWidget {
   /// Shared app facade used to access game assets and the audio backend.
-  final Wolf3d wolf3d;
+  final Wolf3dFlutterEngine wolf3d;
 
   const AudioGallery({super.key, required this.wolf3d});