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/pages/QuickPurchase.tsx

@@ -48,10 +48,6 @@ function formatPeriodLabel(
   return t('landing.periodLabels.nDays', { count: days });
 }
 
-// ============================================================
-// Sub-components
-// ============================================================
-
 function LoadingSkeleton() {
   return (
     <div className="flex min-h-dvh items-center justify-center bg-dark-950">
@@ -611,10 +607,6 @@ function SummaryCard({
   );
 }
 
-// ============================================================
-// Discount Countdown
-// ============================================================
-
 function TimeUnit({ value, label }: { value: number; label: string }) {
   return (
     <div className="flex flex-col items-center">
@@ -715,10 +707,6 @@ function DiscountBanner({
   );
 }
 
-// ============================================================
-// Main Component
-// ============================================================
-
 export default function QuickPurchase() {
   const { slug } = useParams<{ slug: string }>();
   const { t, i18n } = useTranslation();