fix: resolve test failures and improve test stability

- Fix navigation menu display and click issues
- Fix scroll to top/bottom test failures
- Fix section display tests by removing non-existent contact section
- Add data-testid attributes for better test reliability
- Optimize test expectations for scroll behavior
- Add contact page layout for metadata export
- Update section components with proper ARIA attributes

src/components/sections/cases-section.tsx

@@ -18,7 +18,7 @@ export function CasesSection() {
   const featuredCases = CASES.slice(0, 3);
 
   return (
-    <section id="cases" className="py-24 bg-white relative overflow-hidden" ref={ref}>
+    <section id="cases" role="region" aria-labelledby="cases-heading" className="py-24 bg-white relative overflow-hidden" ref={ref}>
       <div className="absolute top-1/3 left-0 w-[400px] h-[400px] bg-[rgba(196,30,58,0.03)] rounded-full blur-3xl" />
       <div className="absolute top-1/3 right-0 w-[300px] h-[300px] bg-[rgba(196,30,58,0.02)] rounded-full blur-3xl" />
       
@@ -29,7 +29,7 @@ export function CasesSection() {
           transition={{ duration: 0.6 }}
           className="text-center max-w-3xl mx-auto mb-16"
         >
-          <h2 className="text-4xl md:text-5xl font-bold text-[#1C1C1C] mb-4">
+          <h2 id="cases-heading" className="text-4xl md:text-5xl font-bold text-[#1C1C1C] mb-4">
             与谁同行，<span className="text-[#C41E3A]">决定能走多远</span>
           </h2>
           <p className="text-lg text-[#5C5C5C] max-w-2xl mx-auto">