Allow super administrators to access the admin dashboard

Update `AdminDashboard.tsx` to include 'superadmin' role for access. Modify `Home.tsx` to navigate to '/admin' when the admin button is clicked.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/LZrXNFV

client/src/pages/Home.tsx

@@ -11,6 +11,10 @@ export default function Home() {
     window.location.href = "/api/logout";
   };
 
+  const handleAdminPage = () => {
+    window.location.href = "/admin";
+  };
+
   return (
     <div className="min-h-screen bg-gray-50">
       {/* Header */}
@@ -41,7 +45,7 @@ export default function Home() {
               <Button 
                 variant="ghost" 
                 size="sm"
-                onClick={handleLogout}
+                onClick={handleAdminPage}
                 data-testid="button-admin"
               >
                 관리자 페이지