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/AppWithNavigator.tsx

@@ -39,9 +39,7 @@ function TelegramBackButton() {
       } else {
         showBackButton();
       }
-    } catch {
-      // Back button not mounted
-    }
+    } catch {}
   }, [location]);
 
   // Stable handler — ref prevents re-subscription on every render
@@ -52,15 +50,11 @@ function TelegramBackButton() {
   useEffect(() => {
     try {
       onBackButtonClick(handler);
-    } catch {
-      // Back button not mounted
-    }
+    } catch {}
     return () => {
       try {
         offBackButtonClick(handler);
-      } catch {
-        // Back button not mounted
-      }
+      } catch {}
     };
   }, [handler]);