- Add linkingProvider state to prevent double-click on Link button
- Use wall-clock based countdown timer to prevent drift
- Clean up onBlur setTimeout ref on unmount
- Extract TelegramIcon + EmailIcon to shared ProviderIcon component
- Remove duplicated icons from ConnectedAccounts and MergeAccounts
- Remove isPending from canUnlink (buttons already have disabled prop)
- Add onSettled to reset confirmingUnlink state after mutation
- 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
- Fix false success toast when response.success is false (CRITICAL)
- Remove mergeToken! non-null assertion in queryFn
- Add early return for missing mergeToken param
- Zero-pad minutes in formatCountdown (MM:SS format)
- Clamp negative seconds in formatCountdown
- Block all unlink buttons while any unlink mutation is pending
- Clear OAuth state only after validation succeeds (not before)
- Split getAndClearLinkOAuthState into read + clear functions
Add Connected Accounts page (link/unlink OAuth providers), Link OAuth
Callback handler, and Merge Accounts page with subscription comparison
and user choice. Includes API methods, TypeScript types, routes in
App.tsx, navigation from Profile, and i18n for all 4 locales (ru, en,
zh, fa). Merge page works without JWT auth (validated by merge token).
