Add prettier as a dev dependency

Author: WZWren

peerprep/package-lock.json

@@ -15,8 +15,10 @@
     "eslint": "8.57.1",
     "eslint-config-next": "14.2.13",
     "next": "14.2.13",
+    "prettier": "^3.3.3",
     "react": "18.3.1",
     "react-dom": "18.3.1",
+    "save-dev": "^0.0.1-security",
     "typescript": "5.6.2",
     "zod": "^3.23.8"
   },