- Add aria-hidden="true" to all decorative SVGs (TelegramIcon, EmailIcon
in MergeAccounts + ConnectedAccounts, all 4 OAuthProviderIcon SVGs)
- Add role="radiogroup" with aria-label to subscription choice container
- Clear react-query cache after merge to prevent stale data
- Wrap checkAdminStatus() in try-catch to prevent throw after token set
- Navigate to /profile/accounts after merge instead of /
- Import useQueryClient for cache management
- Add OAuthProvider type and extend User.auth_type union
- Add OAuth API methods (providers, authorize, callback)
- Add loginWithOAuth to auth store
- Create OAuthCallback page with state validation
- Create OAuthProviderIcon component with brand SVGs
- Add OAuth buttons to Login page between Telegram and Email
- Add OAuth callback route to App.tsx
- Add translations for ru, en, zh, fa
