feat: add superadmin management

context/AuthContext.tsx

@@ -74,10 +74,11 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
   );
 };
 
-const toFrontendUser = (user: { email: string; name: string; role: string }): User => ({
+const toFrontendUser = (user: { id: string; email: string; name: string; role: string }): User => ({
+  id: user.id,
   email: user.email,
   name: user.name,
-  role: user.role === 'student' ? 'student' : 'professor',
+  role: user.role === 'admin' ? 'superadmin' : user.role === 'instructor' ? 'professor' : 'student',
 });
 
 export const useAuth = () => {