Fix: Stable Prisma 6 setup, database seeding, and routing improvements

frontend/package.json

@@ -15,6 +15,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
+    "@playwright/test": "^1.60.0",
     "@types/node": "^24.12.3",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
@@ -24,6 +25,7 @@
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.6.0",
+    "playwright": "^1.60.0",
     "postcss": "^8.5.15",
     "tailwindcss": "^4.3.0",
     "typescript": "~6.0.2",