Update nextjs monorepo to v16 (major) (#113)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

package.json

@@ -19,7 +19,7 @@
     "livekit-client": "^2.9.5",
     "livekit-server-sdk": "^2.13.0",
     "lodash": "^4.17.21",
-    "next": "^14.2.20",
+    "next": "^16.0.0",
     "next-plugin-preval": "^1.2.6",
     "qrcode.react": "^4.1.0",
     "react": "^18.3.1",
@@ -33,7 +33,7 @@
     "@types/react-dom": "^18.3.3",
     "autoprefixer": "^10.4.20",
     "eslint": "^8.57.1",
-    "eslint-config-next": "14.2.26",
+    "eslint-config-next": "16.0.5",
     "postcss": "^8.4.49",
     "tailwindcss": "^4.0.0",
     "typescript": "^5.7.2",