fix(admin): fix Topbar profile dropdown and logout action [TASK-26.1]

frontend/admin-panel/src/components/Topbar.tsx

@@ -1,6 +1,7 @@
 import { useState, useRef, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { Bell, Search, UserCircle, Menu } from 'lucide-react';
+import { toast } from 'react-hot-toast';
 
 interface TopbarProps {
   toggleMenu: () => void;