feat: Enhance intro splash screen with retail warning and dynamic slide management

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

packages/wolf_3d_dart/lib/src/engine/wolf_3d_engine_base.dart

@@ -184,6 +184,7 @@ class WolfEngine {
       initialEpisodeIndex: _currentEpisodeIndex,
       initialDifficulty: difficulty,
       hasResumableGame: false,
+      initialGameIsRetail: data.version == GameVersion.retail,
     );
 
     if (_availableGames.length == 1) {
@@ -373,7 +374,9 @@ class WolfEngine {
       _currentEpisodeIndex = 0;
       onEpisodeSelected?.call(null);
       menuManager.clearEpisodeSelection();
-      menuManager.beginIntroSplash();
+      menuManager.beginIntroSplash(
+        includeRetailWarning: data.version == GameVersion.retail,
+      );
     }
   }