Complete Cocos Creator port with level bundles, themes, and tooling.

Adds level prefabs, theme assets, audio, extensions, and deployment scripts for the Unity WebGL migration.

Co-authored-by: Cursor <cursoragent@cursor.com>

extensions/plugin-import-2x/creator/components/ScrollBar.ts

@@ -0,0 +1,53 @@
+'use strict';
+export const SCROLLBAR = {
+    "__type__": "cc.ScrollBar",
+    "_name": "",
+    "_objFlags": 0,
+    "node": null,
+    "_enabled": true,
+    "__prefab": null,
+    "_scrollView": null,
+    "_handle": null,
+    "_direction": 0,
+    "_enableAutoHide": false,
+    "_autoHideTime": 1,
+};
+
+export class Scrollbar {
+
+    static create() {
+        return JSON.parse(JSON.stringify(SCROLLBAR));
+    }
+
+    static async migrate(json2D: any) {
+        const source = JSON.parse(JSON.stringify(SCROLLBAR));
+        for (const key in json2D) {
+            const value = json2D[key];
+            if (key === '__type__' || value === undefined || value === null) { continue; }
+            switch (key) {
+                case '_N$handle':
+                    source._handle = value;
+                    break;
+                case '_N$direction':
+                    source._direction = value;
+                    break;
+                case 'enableAutoHide':
+                    source._enableAutoHide = value;
+                    break;
+                case 'autoHideTime':
+                    source._autoHideTime = value;
+                    break;
+                default:
+                    source[key] = value;
+                    break;
+            }
+        }
+        return source;
+    }
+
+    static async apply(index: number, json2D: any, json3D: any) {
+        const source = await Scrollbar.migrate(json2D[index]);
+        json3D.splice(index, 1, source);
+        return source;
+    }
+}