Remove dashboard document management link

frontend/src/pages/DashboardPage.jsx

@@ -13,7 +13,6 @@ function greeting(name) {
 
 export default function DashboardPage() {
   const { user } = useAuth()
-  const isModerator = user?.role === 'admin' || user?.role === 'moderator'
   const [stats, setStats] = useState(null)
   const [history, setHistory] = useState([])
   const [selectedQuizId, setSelectedQuizId] = useState(null)
@@ -47,7 +46,7 @@ export default function DashboardPage() {
       if (histRes.data.length > 0) setSelectedQuizId(histRes.data[0].quiz_id)
     }).catch(console.error)
       .finally(() => setLoading(false))
-  }, [isModerator])
+  }, [])
 
   if (loading) return <div className="loading"><div className="spinner"></div> Loading...</div>
 
@@ -153,12 +152,6 @@ export default function DashboardPage() {
           )}
         </div>
       )}
-
-      {isModerator && (
-        <div style={{ textAlign: 'center', marginTop: 8 }}>
-          <Link to="/upload" className="btn btn-secondary">Manage Documents</Link>
-        </div>
-      )}
     </div>
   )
 }