fix: add news link to admin panel, prevent empty news section flash

- Add News item to marketing group in AdminPanel with NewspaperIcon
- Add news nav/panel translations for all 4 locales (ru, en, zh, fa)
- Don't render NewsSection until query confirms articles exist
- Remove skeleton that caused brief flash when news list is empty

src/pages/AdminPanel.tsx

@@ -259,6 +259,16 @@ const NetworkGraphIcon = () => (
   </svg>
 );
 
+const NewspaperIcon = () => (
+  <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
+    <path
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      d="M12 7.5h1.5m-1.5 3h1.5m-7.5 3h7.5m-7.5 3h7.5m3-9h3.375c.621 0 1.125.504 1.125 1.125V18a2.25 2.25 0 01-2.25 2.25M16.5 7.5V18a2.25 2.25 0 002.25 2.25M16.5 7.5V4.875c0-.621-.504-1.125-1.125-1.125H4.125C3.504 3.75 3 4.254 3 4.875V18a2.25 2.25 0 002.25 2.25h13.5M6 7.5h3v3H6v-3z"
+    />
+  </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" />
@@ -538,6 +548,13 @@ export default function AdminPanel() {
       iconBg: 'bg-error-500/20',
       iconColor: 'text-error-400',
       items: [
+        {
+          to: '/admin/news',
+          icon: <NewspaperIcon />,
+          title: t('admin.nav.news'),
+          description: t('admin.panel.newsDesc'),
+          permission: 'news:read',
+        },
         {
           to: '/admin/campaigns',
           icon: <MegaphoneIcon />,