adds engine

Author: gregfromstl

apps/playground-web/package.json

@@ -28,6 +28,7 @@
     "@radix-ui/react-tabs": "^1.1.1",
     "@radix-ui/react-tooltip": "1.1.4",
     "@tanstack/react-query": "5.61.4",
+    "@thirdweb-dev/engine": "^0.0.16",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "0.461.0",