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/backgrounds/BackgroundRenderer.tsx

@@ -66,9 +66,7 @@ if (cachedConfig?.enabled && cachedConfig.type && cachedConfig.type !== 'none')
 function setCachedConfig(config: AnimationConfig) {
   try {
     localStorage.setItem(ANIMATION_CACHE_KEY, JSON.stringify(config));
-  } catch {
-    // localStorage not available
-  }
+  } catch {}
 }
 
 export function setCachedAnimationConfig(config: AnimationConfig) {