fix(动画): 修复首页动画重复播放和顶部导航显示问题

修复首页动画在特定条件下可能重复播放的问题，通过添加 hasPlayedIntro 状态控制
优化顶部导航的显示逻辑，增加即时显示和隐藏功能，并清理事件监听和定时器

app/components/layouts/ArcticNewOneHeader.vue

@@ -68,6 +68,7 @@ const playHeaderIntro = () => {
       duration: 1.4,
       ease: 'power4.out',
       delay: 0,
+      overwrite: 'auto',
       clearProps: 'transform',
       onComplete: () => {
         // 动画完成时，强制把 style 的 opacity 移除，防止被内联样式锁死
@@ -76,6 +77,7 @@ const playHeaderIntro = () => {
         }
         // 进场动画完毕后，再将滚动消失动画挂载到 ScrollTrigger
         if (topHeaderTween) {
+          topHeaderTween.scrollTrigger?.kill()
           ScrollTrigger.create({
             animation: topHeaderTween,
             start: 0,
@@ -93,6 +95,39 @@ const handleHeroReady = () => {
   playHeaderIntro()
 }
 
+const cleanupHeroReadyHook = () => {
+  if (fallbackTimer) {
+    clearTimeout(fallbackTimer)
+    fallbackTimer = null
+  }
+  if (typeof window !== 'undefined') {
+    window.removeEventListener('hero-intro-done', handleHeroReady)
+  }
+}
+
+const hideTopHeader = () => {
+  if (!topHeaderRef.value) return
+  gsap.set(topHeaderRef.value, { y: '100vh', opacity: 0 })
+}
+
+const showTopHeaderInstant = () => {
+  if (!topHeaderRef.value) return
+
+  gsap.set(topHeaderRef.value, { y: 0, opacity: 1 })
+  topHeaderRef.value.style.opacity = ''
+
+  if (topHeaderTween) {
+    topHeaderTween.scrollTrigger?.kill()
+    ScrollTrigger.create({
+      animation: topHeaderTween,
+      start: 0,
+      end: 200,
+      scrub: true,
+    })
+    ScrollTrigger.refresh()
+  }
+}
+
 onMounted(() => {
   // 顶部导航在页面刚开始滚动的前 200px 内逐渐上移并隐藏。
   topHeaderTween = gsap.to(topHeaderRef.value, {
@@ -130,36 +165,34 @@ onMounted(() => {
   })
 
   ScrollTrigger.refresh()
+
+  if (!appStore.isAppLoading && route.path !== '/') {
+    showTopHeaderInstant()
+  }
 })
 
-// 监听全局加载状态，当加载完成后再决定 Header 的进场时机
-watch(() => appStore.isAppLoading, (isLoading) => {
-  if (!isLoading && typeof window !== 'undefined') {
-    if (route.path === '/') {
-      // 首页：等待自定义事件
-      window.addEventListener('hero-intro-done', handleHeroReady, { once: true })
+watch([() => appStore.isAppLoading, () => route.path], ([isLoading, path]) => {
+  if (isLoading || typeof window === 'undefined') return
 
-      // 增加一个保底的 setTimeout，防止首页的动画事件因为某种原因未能触发
-      // 从 loading 结束开始算起，首页的 intro 和 hero 动画加起来大约 3~4 秒
-      fallbackTimer = setTimeout(() => {
-        window.removeEventListener('hero-intro-done', handleHeroReady)
-        playHeaderIntro()
-      }, 5000)
-    } else {
-      // 非首页：加载完成后直接进场
+  cleanupHeroReadyHook()
+
+  if (path === '/') {
+    hideTopHeader()
+
+    window.addEventListener('hero-intro-done', handleHeroReady, { once: true })
+
+    fallbackTimer = setTimeout(() => {
+      window.removeEventListener('hero-intro-done', handleHeroReady)
       playHeaderIntro()
-    }
+    }, 5000)
+    return
   }
+
+  showTopHeaderInstant()
 }, { immediate: true })
 
 onBeforeUnmount(() => {
-    if (fallbackTimer) {
-      clearTimeout(fallbackTimer)
-      fallbackTimer = null
-    }
-    if (typeof window !== 'undefined') {
-      window.removeEventListener('hero-intro-done', handleHeroReady)
-    }
+    cleanupHeroReadyHook()
     topHeaderTween?.scrollTrigger?.kill()
     topHeaderTween?.kill()
     bottomHeaderScrollTrigger?.kill()