fix: resolve telegram auth token expiration and clean up codebase

- Fix stale initData comparison in clearStaleSessionIfNeeded that destroyed
  valid refresh tokens on mobile WebView reopens
- Restrict X-Telegram-Init-Data header to auth endpoints only
- Close Mini App on auth retry to force fresh initData from Telegram
- Merge Connection page error/not-configured states for better UX
- Remove unnecessary comments across 40+ files (section dividers,
  restating comments, noise catch block comments)
- Configure ESLint allowEmptyCatch to properly handle intentional
  empty catch blocks (62 warnings resolved)

src/components/SuccessNotificationModal.tsx

@@ -108,7 +108,6 @@ export default function SuccessNotificationModal() {
     return () => document.removeEventListener('keydown', handleKeyDown);
   }, [isOpen, handleClose]);
 
-  // Haptic feedback on open
   useEffect(() => {
     if (isOpen) {
       haptic.notification('success');