feat: complete Style 32 overhaul & Tiled integration fix

- Enforced 'Style 32 - Dark Chibi Vector' for all ground assets.
- Fixed critical Prologue-to-Game crash (function renaming).
- Implemented Tiled JSON/TMX auto-conversion.
- Updated Asset Manager to visualize 1800+ assets.
- Cleaned up project structure (new assets/grounds folder).
- Auto-Ground logic added to GameScene.js.

src/systems/WaterPhysicsSystem.js

@@ -11,7 +11,7 @@
  * Style 32 Dark-Chibi Noir compatible
  */
 
-export default class WaterPhysicsSystem {
+class WaterPhysicsSystem {
     constructor(scene) {
         this.scene = scene;