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

vitest.setup.ts

@@ -1,5 +1,26 @@
 import '@testing-library/jest-dom';
 import { afterEach, beforeEach, vi } from 'vitest';
+import { readFileSync } from 'fs';
+import { resolve } from 'path';
+import React from 'react';
+
+// 读取中文翻译文件用于 withTranslation mock
+const zhCommon = JSON.parse(
+  readFileSync(resolve(__dirname, 'i18n/locales/zh/common.json'), 'utf-8'),
+);
+
+// 支持嵌套 key 查找，如 "errorBoundary.title" → zhCommon.errorBoundary.title
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function nestedLookup(obj: Record<string, any>, key: string): string | undefined {
+  const parts = key.split('.');
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  let current: any = obj;
+  for (const part of parts) {
+    if (current == null || typeof current !== 'object') return undefined;
+    current = current[part];
+  }
+  return typeof current === 'string' ? current : undefined;
+}
 
 vi.mock('@/utils/useLazyTranslation', () => ({
   useLazyTranslation: (ns?: string) => ({
@@ -21,12 +42,53 @@ vi.mock('react-i18next', () => ({
       language: 'zh-CN',
     },
   }),
+  withTranslation: (ns?: string) => {
+    const translations = ns === 'common' ? zhCommon : {};
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return (Component: React.ComponentType<any>) => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const Wrapped = (props: any) =>
+        React.createElement(Component, {
+          ...props,
+          t: (key: string) => nestedLookup(translations, key) || key,
+          i18n: { language: 'zh-CN', changeLanguage: vi.fn() },
+        });
+      Wrapped.displayName = `withTranslation(${Component.displayName || Component.name || 'Component'})`;
+      return Wrapped;
+    };
+  },
   initReactI18next: {
     type: '3rdParty',
     init: vi.fn().mockResolvedValue(undefined),
   },
 }));
 
+vi.mock('@/components/CopyButton', () => ({
+  CopyButton: ({
+    text,
+    tooltip,
+    onClick,
+  }: {
+    text: string;
+    tooltip?: string;
+    onClick?: (e: React.MouseEvent) => void;
+  }) =>
+    React.createElement(
+      'button',
+      {
+        'aria-label': tooltip || 'copy',
+        type: 'button',
+        onClick: async (e: React.MouseEvent) => {
+          if (text) {
+            await navigator.clipboard.writeText(text);
+          }
+          onClick?.(e);
+        },
+      },
+      'Copy',
+    ),
+}));
+
 const storageMock = {
   local: {
     get: vi.fn().mockImplementation(() => Promise.resolve({})),