fix(tests): 修复 CI 失败的测试 - 补充 withTranslation 和 CopyButton mock

- vitest.setup.ts: react-i18next mock 添加 withTranslation HOC（读取 zh/common.json 翻译）
- vitest.setup.ts: 添加 @/components/CopyButton 全局 mock
- App 测试: 补充 withTranslation 导出
- TextMode 测试: 修复多个 CopyButton 实例导致的 getByTestId 冲突，改用 getByRole

entrypoints/options/__tests__/App.test.tsx

@@ -21,6 +21,7 @@ vi.mock('react-i18next', () => ({
   useTranslation: () => ({
     t: (key: string) => key,
   }),
+  withTranslation: () => (Component: any) => Component,
 }));
 
 describe('Options App', () => {