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/UIOpacity.ts

@@ -0,0 +1,61 @@
+'use strict';
+
+export const UIOPACITY = {
+    "__type__": "cc.UIOpacity",
+    "_name": "",
+    "_objFlags": 0,
+    "node": null,
+    "_enabled": true,
+    "__prefab": null,
+    "_opacity": 255,
+};
+
+export class UIOpacity {
+
+    static create() {
+        return JSON.parse(JSON.stringify(UIOPACITY));
+    }
+
+    static add(node: any, nodeID: number, json3D: any) {
+        let uiOpacity;
+        node._components.find((obj: any) => {
+            const comp = json3D[obj.__id__];
+            if (comp && comp.__type__ === 'cc.UIOpacity') {
+                uiOpacity = comp;
+                return comp;
+            }
+        });
+        if (!uiOpacity) {
+            uiOpacity = UIOpacity.create();
+            uiOpacity.node = {
+                __id__: nodeID,
+            };
+            json3D.push(uiOpacity);
+            node._components.push({
+                __id__: json3D.length - 1,
+            });
+        }
+        return uiOpacity;
+    }
+
+    static setOpacity(node: any, nodeID: number, opacity: any, json3D: any) {
+        const uiOpacity = UIOpacity.add(node, nodeID, json3D) as any;
+        uiOpacity._opacity = opacity;
+    }
+
+    static async migrate(json2D: any) {
+        const source = JSON.parse(JSON.stringify(UIOPACITY));
+        for (const key in json2D) {
+            const value = json2D[key];
+            if (key === '__type__' || value === undefined || value === null) { continue; }
+            source[key] = value;
+        }
+        return source;
+    }
+
+    static async apply(index: number, json2D: any, json3D: any) {
+        const source = await UIOpacity.migrate(json2D[index]);
+        json3D.splice(index, 1, source);
+        return source;
+    }
+}