Migrate to Telegram Navigator integration

Replace manual BackButton management with official @telegram-apps/react-router-integration
to fix navigation issues (back button cycling and double-click).

Changes:
- Migrate from @tma.js/sdk-react to @telegram-apps/sdk-react
- Downgrade react-router-dom to v6 for package compatibility
- Add AppWithNavigator component with Telegram navigator integration
- Use browser history mode (hashMode: null) to prevent hash URLs
- Add multi-level platform detection (user data, platform, version)
- Add try-catch error handling for navigator attach/detach
- Simplify useBackButton hook to no-op (navigator handles automatically)
- Update vite config with new Telegram packages

The navigator automatically manages BackButton based on router history,
falling back to BrowserRouter in regular browser environment.

package.json

@@ -32,7 +32,8 @@
     "@radix-ui/react-tooltip": "^1.2.8",
     "@radix-ui/react-visually-hidden": "^1.2.4",
     "@tanstack/react-query": "^5.8.0",
-    "@tma.js/sdk-react": "^3.0.15",
+    "@telegram-apps/react-router-integration": "^1.0.1",
+    "@telegram-apps/sdk-react": "^3.3.9",
     "axios": "^1.6.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -45,7 +46,7 @@
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-i18next": "^13.5.0",
-    "react-router-dom": "^7.13.0",
+    "react-router-dom": "^6.30.3",
     "tailwind-merge": "^3.4.0",
     "zustand": "^4.4.0"
   },