Fix ban screen

frontend/src/pages/LoginPage.tsx

@@ -54,7 +54,8 @@ export function LoginPage() {
 
       navigate('/marathons')
     } catch {
-      setSubmitError(error || 'Ошибка входа')
+      // Error is already set in store by login function
+      // Ban case is handled separately via banInfo state
     }
   }