feat: Linear-style UI redesign with improved mobile experience

Major changes:
- Redesign cabinet with Linear-style components and top navigation
- Replace detail modals with dedicated pages (users, broadcasts, email templates)
- Add email channel support for broadcasts
- Remove pull-to-refresh, improve drag-and-drop on touch devices
- Fix Telegram Mini App: fullscreen, back button, scroll restoration
- Unify admin pages color scheme to design system
- Mobile-first improvements: horizontal tabs for settings, better touch targets

package.json

@@ -21,15 +21,30 @@
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
     "@lottiefiles/dotlottie-react": "^0.8.0",
+    "@radix-ui/react-alert-dialog": "^1.1.15",
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-dropdown-menu": "^2.1.16",
+    "@radix-ui/react-popover": "^1.1.15",
+    "@radix-ui/react-select": "^2.2.6",
+    "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-switch": "^1.2.6",
+    "@radix-ui/react-tabs": "^1.1.13",
+    "@radix-ui/react-tooltip": "^1.2.8",
+    "@radix-ui/react-visually-hidden": "^1.2.4",
     "@tanstack/react-query": "^5.8.0",
     "axios": "^1.6.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "cmdk": "^1.1.1",
     "dompurify": "^3.3.1",
+    "framer-motion": "^12.29.2",
     "i18next": "^23.7.0",
     "i18next-browser-languagedetector": "^7.2.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-i18next": "^13.5.0",
     "react-router-dom": "^7.13.0",
+    "tailwind-merge": "^3.4.0",
     "zustand": "^4.4.0"
   },
   "devDependencies": {