fix: use RemnaWave icon in admin panel menu

src/pages/AdminPanel.tsx

@@ -1,5 +1,6 @@
 import { Link } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
+import { RemnawaveIcon } from '../components/icons';
 
 // Group header icons
 const AnalyticsGroupIcon = () => (
@@ -215,16 +216,6 @@ const EnvelopeIcon = () => (
   </svg>
 );
 
-const CubeTransparentIcon = () => (
-  <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
-    <path
-      strokeLinecap="round"
-      strokeLinejoin="round"
-      d="M21 7.5l-2.25-1.313M21 7.5v2.25m0-2.25l-2.25 1.313M3 7.5l2.25-1.313M3 7.5l2.25 1.313M3 7.5v2.25m9 3l2.25-1.313M12 12.75l-2.25-1.313M12 12.75V15m0 6.75l2.25-1.313M12 21.75V19.5m0 2.25l-2.25-1.313m0-16.875L12 2.25l2.25 1.313M21 14.25v2.25l-2.25 1.313m-13.5 0L3 16.5v-2.25"
-    />
-  </svg>
-);
-
 const ChevronRightIcon = () => (
   <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
     <path strokeLinecap="round" strokeLinejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
@@ -456,7 +447,7 @@ export default function AdminPanel() {
         },
         {
           to: '/admin/remnawave',
-          icon: <CubeTransparentIcon />,
+          icon: <RemnawaveIcon />,
           title: t('admin.nav.remnawave'),
           description: t('admin.panel.remnawaveDesc'),
         },