fix(frontend): prettier config

frontend/package.json

@@ -9,7 +9,8 @@
     "build": "next build",
     "build:embed": "NEXT_STANDALONE_EXPORT=true next build",
     "start": "next start -p 3010",
-    "lint": "eslint"
+    "lint": "eslint",
+    "format": "prettier --write ."
   },
   "dependencies": {
     "@codemirror/lang-sql": "^6.10.0",
@@ -92,6 +93,7 @@
     "eslint": "^9",
     "eslint-config-next": "15.5.6",
     "jsdom": "^29.1.1",
+    "prettier": "^3.9.5",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.4.0",
     "typescript": "^5.9.3",