Fix unused import to fix build

Author: openhands-agent

src/components/timeline/__tests__/Timeline.test.tsx

@@ -1,6 +1,6 @@
 import { render, screen } from '@testing-library/react';
 import '@testing-library/jest-dom';
-import { vi, describe, test, expect, beforeEach } from 'vitest';
+import { vi, describe, test, expect } from 'vitest';
 import { Timeline } from '../Timeline';
 import { TimelineEntry } from '../types';