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/lib/animations.test.tsx

@@ -77,7 +77,7 @@ describe('Animation Variants', () => {
 
     it('should have correct transition configuration', async () => {
       const { inkVariants } = await import('./animations');
-      const transition = inkVariants.visible.transition as any;
+      const transition = (inkVariants.visible as any)?.transition;
       expect(transition.duration).toBe(0.8);
       expect(transition.ease).toEqual([0.16, 1, 0.3, 1]);
     });
@@ -102,7 +102,7 @@ describe('Animation Variants', () => {
 
     it('should use spring animation', async () => {
       const { sealStampVariants } = await import('./animations');
-      const transition = sealStampVariants.visible.transition as any;
+      const transition = (sealStampVariants.visible as any)?.transition;
       expect(transition.type).toBe('spring');
       expect(transition.stiffness).toBe(300);
       expect(transition.damping).toBe(20);
@@ -144,7 +144,7 @@ describe('Animation Variants', () => {
   describe('staggerContainerVariants', () => {
     it('should have staggerChildren configured', async () => {
       const { staggerContainerVariants } = await import('./animations');
-      const transition = staggerContainerVariants.visible.transition as any;
+      const transition = (staggerContainerVariants.visible as any)?.transition;
       expect(transition.staggerChildren).toBe(0.1);
       expect(transition.delayChildren).toBe(0.1);
     });
@@ -412,7 +412,7 @@ describe('Animation Components', () => {
       const { GlitchText } = await import('./animations');
       render(<GlitchText text="Test" className="glitch-class" />);
       const testElements = screen.getAllByText('Test');
-      const container = testElements[0].closest('.glitch-class');
+      const container = testElements[0]?.closest('.glitch-class');
       expect(container).toBeInTheDocument();
     });
   });