fix ui style

app/admin/layout.tsx

@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import Link from "next/link";
 import { redirect } from "next/navigation";
 import { getServerSession } from "next-auth";
+import { Lock } from "lucide-react";
 import { authOptions } from "@/lib/auth";
 import { AdminSidebar } from "@/components/admin/admin-sidebar";
 
@@ -31,7 +32,12 @@ export default async function AdminLayout({
     return (
       <div className="flex min-h-screen items-center justify-center bg-neutral-50 px-4">
         <div className="max-w-md rounded-2xl border border-neutral-200 bg-white p-8 text-center shadow-sm">
-          <p className="text-2xl">🔒</p>
+          <Lock
+            size={28}
+            strokeWidth={1.75}
+            aria-hidden
+            className="mx-auto text-neutral-500"
+          />
           <h1 className="mt-2 text-base font-bold text-neutral-900">
             Halaman khusus admin
           </h1>