refactor: adjust experimental scroll handler configuration

Author: chenyme

frontend/next.config.ts

@@ -3,6 +3,9 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   output: "export",
   experimental: {
+    // The Fragment-ref scroll handler in Next 16.3 Preview can crash during
+    // consecutive client redirects. Keep the stable handler until upstream fixes it.
+    appNewScrollHandler: false,
     useTypeScriptCli: true,
   },
   images: {