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/locales/en.json

@@ -1110,7 +1110,8 @@
       "auditLog": "Audit Log",
       "salesStats": "Sales Statistics",
       "landings": "Landings",
-      "referralNetwork": "Referral Network"
+      "referralNetwork": "Referral Network",
+      "news": "News"
     },
     "panel": {
       "title": "Admin Panel",
@@ -1145,7 +1146,8 @@
       "auditLogDesc": "Review system activity and access history",
       "salesStatsDesc": "Sales analytics and trends",
       "landingsDesc": "Quick purchase landing pages",
-      "referralNetworkDesc": "Referral graph and campaign visualization"
+      "referralNetworkDesc": "Referral graph and campaign visualization",
+      "newsDesc": "Manage news articles and publications"
     },
     "salesStats": {
       "title": "Sales Statistics",

src/locales/fa.json

@@ -944,7 +944,8 @@
       "auditLog": "گزارش بازرسی",
       "salesStats": "آمار فروش",
       "landings": "صفحات فرود",
-      "referralNetwork": "شبکه ارجاع"
+      "referralNetwork": "شبکه ارجاع",
+      "news": "اخبار"
     },
     "panel": {
       "title": "پنل مدیریت",
@@ -979,7 +980,8 @@
       "auditLogDesc": "بررسی فعالیت سیستم و تاریخچه دسترسی",
       "salesStatsDesc": "تحلیل فروش و روندها",
       "landingsDesc": "صفحات خرید سریع",
-      "referralNetworkDesc": "نمایش بصری گراف ارجاعات و کمپین‌ها"
+      "referralNetworkDesc": "نمایش بصری گراف ارجاعات و کمپین‌ها",
+      "newsDesc": "مدیریت مقالات خبری و انتشارات"
     },
     "salesStats": {
       "title": "آمار فروش",

src/locales/ru.json

@@ -1131,7 +1131,8 @@
       "auditLog": "Журнал аудита",
       "salesStats": "Статистика продаж",
       "landings": "Лендинги",
-      "referralNetwork": "Реферальная сеть"
+      "referralNetwork": "Реферальная сеть",
+      "news": "Новости"
     },
     "panel": {
       "title": "Панель администратора",
@@ -1166,7 +1167,8 @@
       "auditLogDesc": "Просмотр активности системы и истории доступа",
       "salesStatsDesc": "Аналитика продаж и тренды",
       "landingsDesc": "Страницы быстрой покупки",
-      "referralNetworkDesc": "Визуализация графа рефералов и РК"
+      "referralNetworkDesc": "Визуализация графа рефералов и РК",
+      "newsDesc": "Управление новостями и статьями"
     },
     "salesStats": {
       "title": "Статистика продаж",

src/locales/zh.json

@@ -944,7 +944,8 @@
       "auditLog": "审计日志",
       "salesStats": "销售统计",
       "landings": "落地页",
-      "referralNetwork": "推荐网络"
+      "referralNetwork": "推荐网络",
+      "news": "新闻"
     },
     "panel": {
       "title": "管理面板",
@@ -979,7 +980,8 @@
       "auditLogDesc": "查看系统活动和访问历史",
       "salesStatsDesc": "销售分析与趋势",
       "landingsDesc": "快速购买落地页",
-      "referralNetworkDesc": "推荐图表和广告活动可视化"
+      "referralNetworkDesc": "推荐图表和广告活动可视化",
+      "newsDesc": "管理新闻文章和出版物"
     },
     "salesStats": {
       "title": "销售统计",