rollback next.js upgrade

Author: hjchen-circle

package-lock.json

@@ -25,7 +25,7 @@
     "clsx": "^2.1.1",
     "ethers": "^6.15.0",
     "lucide-react": "^0.548.0",
-    "next": "^15.5.6",
+    "next": "15.5.4",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-timer-hook": "^4.0.5",