fix(creator-studio): repair structural block deletion

assets/creator-studio/package.json

@@ -4,7 +4,8 @@
   "private": true,
   "scripts": {
     "build": "wp-scripts build",
-    "start": "wp-scripts start"
+    "start": "wp-scripts start",
+    "test": "node --test tests/*.test.cjs"
   },
   "devDependencies": {
     "@types/react": "18.3.31",
@@ -12,6 +13,7 @@
     "@wordpress/element": "5.8.0",
     "@wordpress/i18n": "4.31.0",
     "@wordpress/scripts": "26.4.0",
+    "jsdom": "20.0.3",
     "sass": "1.77.8",
     "typescript": "5.4.5"
   }