chore: remove unused code and tooling

package.json

@@ -7,41 +7,26 @@
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
-    "test": "vitest",
-    "test:e2e": "playwright test"
+    "test": "vitest"
   },
   "dependencies": {
     "@prisma/client": "^6.1.0",
-    "@radix-ui/react-dropdown-menu": "^2.1.4",
-    "@radix-ui/react-navigation-menu": "^1.2.2",
-    "@radix-ui/react-separator": "^1.1.1",
-    "@radix-ui/react-slot": "^1.1.1",
     "@vercel/analytics": "^1.6.1",
     "@vercel/speed-insights": "^1.3.1",
-    "class-variance-authority": "^0.7.1",
-    "clsx": "^2.1.1",
     "lucide-react": "^0.468.0",
     "next": "15.1.11",
     "next-intl": "^4.0.2",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-markdown": "^10.1.0",
-    "rehype-raw": "^7.0.0",
     "rehype-sanitize": "^6.0.0",
-    "rehype-shiki": "^0.0.9",
     "remark-gfm": "^4.0.1",
-    "shiki": "^3.20.0",
-    "tailwind-merge": "^2.6.0",
     "zod": "^3.24.1"
   },
   "devDependencies": {
-    "@playwright/test": "^1.49.1",
-    "@testing-library/jest-dom": "^6.6.3",
-    "@testing-library/react": "^16.1.0",
     "@types/node": "^22",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
     "eslint": "^9",
     "eslint-config-next": "15.1.11",