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/GiftSubscription.tsx

@@ -21,10 +21,6 @@ import { getApiErrorMessage } from '../utils/api-error';
 import { formatPrice } from '../utils/format';
 import { usePlatform, useHaptic } from '@/platform';
 
-// ============================================================
-// SVG Icons
-// ============================================================
-
 function GiftIcon({ className }: { className?: string }) {
   return (
     <svg
@@ -131,10 +127,6 @@ function InboxIcon({ className }: { className?: string }) {
   );
 }
 
-// ============================================================
-// Helpers
-// ============================================================
-
 function formatPeriodLabel(
   days: number,
   t: (key: string, options?: Record<string, unknown>) => string,
@@ -181,16 +173,8 @@ function formatGiftDate(dateStr: string | null): string {
   });
 }
 
-// ============================================================
-// Tab type
-// ============================================================
-
 type TabId = 'buy' | 'activate' | 'myGifts';
 
-// ============================================================
-// Sub-components: Shared
-// ============================================================
-
 function LoadingSkeleton() {
   return (
     <div className="flex min-h-dvh items-center justify-center">
@@ -263,10 +247,6 @@ function DisabledState() {
   );
 }
 
-// ============================================================
-// Sub-components: Buy Tab
-// ============================================================
-
 function TariffCard({
   tariff,
   isSelected,
@@ -904,10 +884,6 @@ function BuyTabContent({
   );
 }
 
-// ============================================================
-// Sub-components: Activate Tab
-// ============================================================
-
 function ActivateTabContent({ initialCode }: { initialCode?: string | null }) {
   const { t } = useTranslation();
   const queryClient = useQueryClient();
@@ -1023,10 +999,6 @@ function ActivateTabContent({ initialCode }: { initialCode?: string | null }) {
   );
 }
 
-// ============================================================
-// Sub-components: My Gifts Tab
-// ============================================================
-
 function CopiedToast({ onDismiss }: { onDismiss: () => void }) {
   const { t } = useTranslation();
 
@@ -1320,20 +1292,12 @@ function MyGiftsTabContent() {
   );
 }
 
-// ============================================================
-// Tab animation variants
-// ============================================================
-
 const tabContentVariants = {
   initial: { opacity: 0, x: 20 },
   animate: { opacity: 1, x: 0 },
   exit: { opacity: 0, x: -20 },
 };
 
-// ============================================================
-// Main Component
-// ============================================================
-
 export default function GiftSubscription() {
   const { t } = useTranslation();
   const [searchParams] = useSearchParams();