feat: Refactor to use Wolf3dFlutterEngine across the application

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

packages/wolf_3d_flutter/lib/widgets/gallery_game_selector.dart

@@ -20,7 +20,7 @@ String formatGalleryGameTitle(GameVersion version) {
 
 /// Selects which discovered game data set gallery screens should display.
 class GalleryGameSelector extends StatelessWidget {
-  final Wolf3d wolf3d;
+  final Wolf3dFlutterEngine wolf3d;
   final WolfensteinData selectedGame;
   final ValueChanged<WolfensteinData> onSelected;
 

packages/wolf_3d_flutter/lib/widgets/wolf3d_app.dart

@@ -3,10 +3,11 @@ library;
 import 'package:flutter/material.dart';
 import 'package:wolf_3d_flutter/wolf_3d_flutter.dart';
 
-/// Minimal app shell that binds a prepared [Wolf3d] instance to host screens.
+/// Minimal app shell that binds a prepared [Wolf3dFlutterEngine] instance to
+/// host screens.
 class Wolf3dApp extends StatelessWidget {
   /// Shared initialized facade that owns game data, input, and audio services.
-  final Wolf3d wolf3d;
+  final Wolf3dFlutterEngine wolf3d;
 
   const Wolf3dApp({
     super.key,