chore: add prettier to test prettier functionality

Author: seriouslag

examples/react-app/package.json

@@ -16,6 +16,7 @@
     "@tanstack/react-query": "^5.18.1",
     "axios": "^1.6.7",
     "form-data": "~4.0.0",
+    "prettier": "^3.2.5",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },