feat: redesign admin settings with tree navigation and compact layout

- Replace flat sidebar with collapsible tree groups (7 groups, 52 sub-items)
- Map all 61 backend category keys to sidebar navigation
- Add QuickToggles panel for boolean settings
- Replace card-style SettingRow with compact SettingsTableRow
- Add breadcrumb navigation for tree sub-items
- Add source badges (modified/DB/ENV) on settings
- Implement two-level mobile navigation with group chips
- Add i18n translations for all new keys (en, ru, zh, fa)

src/components/admin/FavoritesTab.tsx

@@ -2,7 +2,7 @@ import { useTranslation } from 'react-i18next';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import { SettingDefinition, adminSettingsApi } from '../../api/adminSettings';
 import { StarIcon } from './icons';
-import { SettingRow } from './SettingRow';
+import { SettingsTableRow } from './SettingsTableRow';
 
 interface FavoritesTabProps {
   settings: SettingDefinition[];
@@ -42,9 +42,9 @@ export function FavoritesTab({ settings, isFavorite, toggleFavorite }: Favorites
   }
 
   return (
-    <div className="grid grid-cols-1 gap-4 lg:grid-cols-2">
-      {settings.map((setting) => (
-        <SettingRow
+    <div className="overflow-hidden rounded-xl border border-dark-700/40">
+      {settings.map((setting, idx) => (
+        <SettingsTableRow
           key={setting.key}
           setting={setting}
           isFavorite={isFavorite(setting.key)}
@@ -53,6 +53,7 @@ export function FavoritesTab({ settings, isFavorite, toggleFavorite }: Favorites
           onReset={() => resetSettingMutation.mutate(setting.key)}
           isUpdating={updateSettingMutation.isPending}
           isResetting={resetSettingMutation.isPending}
+          isLast={idx === settings.length - 1}
         />
       ))}
     </div>