fix: useCallback импорт в AdminDashboard (вкладка Операции)

frontend/src/pages/AdminDashboard.jsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useMemo, useState } from 'react';
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
 
 import { apiFetch, apiJson } from '../api/client';
 import { WHO_FOUND_TYPES } from '../constants';
@@ -845,4 +845,4 @@ function AdminDashboard() {
   );
 }
 
-export default AdminDashboard;
+export default AdminDashboard;