fix(types): 修复 16 个 TypeScript 类型检查错误

- 修复 animations.test.tsx 中的 Variant 类型访问问题
- 清理 9 个测试文件中的未使用导入
- 使用可选链操作符处理可能为 undefined 的属性访问
- 修复 mock 组件缺少 displayName 的 ESLint 错误

src/app/(marketing)/about/page.test.tsx

@@ -1,4 +1,4 @@
-import { describe, it, expect, jest, beforeAll } from '@jest/globals';
+import { describe, it, expect, jest } from '@jest/globals';
 import { render, screen } from '@testing-library/react';
 import '@testing-library/jest-dom';
 
@@ -35,11 +35,13 @@ jest.mock('framer-motion', () => ({
 }));
 
 jest.mock('next/link', () => {
-  return ({ children, href, ...props }: any) => (
+  const MockLink = ({ children, href, ...props }: any) => (
     <a href={href} {...props}>
       {children}
     </a>
   );
+  MockLink.displayName = 'MockLink';
+  return MockLink;
 });
 
 jest.mock('lucide-react', () => ({

src/app/(marketing)/products/[id]/page.test.tsx

@@ -11,28 +11,13 @@ jest.mock('next/navigation', () => ({
 }));
 
 jest.mock('next/link', () => {
-  return ({ children, href }: { children: React.ReactNode; href: string }) => {
+  const MockLink = ({ children, href }: { children: React.ReactNode; href: string }) => {
     return <a href={href}>{children}</a>;
   };
+  MockLink.displayName = 'MockLink';
+  return MockLink;
 });
 
-const mockProduct = {
-  id: 'test-product',
-  title: '测试产品',
-  category: '企业软件',
-  description: '这是测试产品描述',
-  overview: '这是测试产品概述',
-  features: ['功能1', '功能2'],
-  benefits: ['优势1', '优势2'],
-  process: ['步骤1', '步骤2'],
-  specs: ['规格1', '规格2'],
-  pricing: {
-    base: '¥10,000/年',
-    standard: '¥30,000/年',
-    enterprise: '定制',
-  },
-};
-
 jest.mock('@/lib/constants', () => ({
   PRODUCTS: [
     {