fix(deps): update nextjs monorepo to v16

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
     "firebase": "^12.4.0",
     "genkit": "^1.13.0",
     "lucide-react": "^0.553.0",
-    "next": "15.5.6",
+    "next": "16.0.1",
     "patch-package": "^8.0.0",
     "react": "^19.0.0",
     "react-day-picker": "^9.0.0",
@@ -71,7 +71,7 @@
     "@typescript-eslint/parser": "^8.38.0",
     "autoprefixer": "^10.4.20",
     "eslint": "^9.32.0",
-    "eslint-config-next": "^15.4.4",
+    "eslint-config-next": "^16.0.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-formatter-unix": "^9.0.0",
     "eslint-plugin-prettier": "^5.5.3",