formatted with prettier

frontend/package.json

@@ -7,7 +7,9 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
   },
   "dependencies": {
     "@tailwindcss/typography": "^0.5.16",
@@ -29,6 +31,7 @@
     "eslint-plugin-react-refresh": "^0.4.9",
     "globals": "^15.9.0",
     "postcss": "^8.4.45",
+    "prettier": "^3.5.3",
     "tailwindcss": "^3.4.11",
     "typescript": "^5.5.3",
     "typescript-eslint": "^8.0.1",