refactor(Timestamp): 规范化页面组件目录结构

- 将子组件移至 components/ 子目录（LiveClock、ResultView）
- 创建 __tests__/ 目录结构
- 更新所有相关导入路径

Co-authored-by: Cursor <cursoragent@cursor.com>

src/pages/Timestamp/__tests__/index.test.tsx

@@ -0,0 +1,11 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import Index from '../index';
+
+describe('Timestamp 页面', () => {
+  it('应该渲染页面标题', () => {
+    render(<Index />);
+    // 基本渲染测试
+    expect(screen.getByRole('button')).toBeInTheDocument();
+  });
+});

src/pages/Timestamp/components/LiveClock.tsx

@@ -2,8 +2,8 @@ import React, { useEffect, useState } from 'react';
 import { Clock } from 'lucide-react';
 import { toast } from 'sonner';
 import { CopyButton } from '@/components/CopyButton';
-import type { UnitType } from './constants';
-import { msToUnit } from './constants';
+import type { UnitType } from '../constants';
+import { msToUnit } from '../constants';
 import { useI18n } from '@/utils/chromeI18n';
 import { cn } from '@/lib/utils';
 

src/pages/Timestamp/index.tsx

@@ -1,8 +1,8 @@
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
 import { ZONES } from './constants';
 import type { ModeType, UnitType, ZoneType } from './constants';
-import LiveClock from './LiveClock';
-import ResultView from './ResultView';
+import LiveClock from './components/LiveClock';
+import ResultView from './components/ResultView';
 import { useTimestampConverter } from './useTimestampConverter';
 import { useI18n } from '@/utils/chromeI18n';
 import { cn } from '@/lib/utils';