fix: resolve all 14 ESLint warnings across the codebase

- Add varsIgnorePattern to no-unused-vars for destructuring patterns
- Fix all react-hooks/exhaustive-deps by adding missing dependencies
- Refactor useAnimatedNumber to use ref instead of stale state closure
- Wrap handleLinkResult in useCallback for stable deps
- Extract OAuth utilities from OAuthCallback.tsx to utils/oauth.ts
- Extract background config utilities to utils/backgroundConfig.ts
- Remove unused catch parameter in GiftSubscription

src/components/TelegramLoginButton.tsx

@@ -103,7 +103,7 @@ export default function TelegramLoginButton({ referralCode }: TelegramLoginButto
       setScriptLoaded(true);
       initTelegramLogin();
     }
-  }, [isOIDC, widgetConfig?.oidc_client_id, widgetConfig?.request_access]);
+  }, [isOIDC, widgetConfig?.oidc_client_id, widgetConfig?.request_access, t]);
 
   // Legacy widget effect (only when NOT OIDC)
   const loginWithTelegramWidget = useAuthStore((s) => s.loginWithTelegramWidget);