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/AdminPaymentMethods.tsx

@@ -23,8 +23,6 @@ import {
 import { CSS } from '@dnd-kit/utilities';
 import { adminPaymentMethodsApi } from '../api/adminPaymentMethods';
 import type { PaymentMethodConfig } from '../types';
-// ============ Icons ============
-
 const BackIcon = () => (
   <svg
     className="h-5 w-5 text-dark-400"
@@ -63,8 +61,6 @@ const SaveIcon = () => (
   </svg>
 );
 
-// ============ Sortable Card ============
-
 interface SortableCardProps {
   config: PaymentMethodConfig;
   onClick: () => void;
@@ -184,10 +180,6 @@ function SortablePaymentCard({ config, onClick }: SortableCardProps) {
   );
 }
 
-// ============ Toast ============
-
-// ============ Main Page ============
-
 export default function AdminPaymentMethods() {
   const { t } = useTranslation();
   const navigate = useNavigate();