fix: 尝试安卓优化

vite-tailwindcss/src/components/PhotoGallery.vue

@@ -238,6 +238,34 @@ const preloadNineGridImages = () => {
   }
 }
 
+/** 安卓专项：把当前 page 的所有图都预热（不创建 DOM，仅触发浏览器缓存下载）
+ *  让浏览器在空闲时下载+解码，避免滑到时才下载造成卡顿。
+ *  iOS 不预热，保留原串行体验。 */
+const isAndroidClient = (() => {
+  if (typeof navigator === 'undefined') return false
+  const ua = navigator.userAgent || ''
+  return /Android/i.test(ua) && !/CrOS/i.test(ua)
+})()
+let androidPreloadStarted = false
+const preloadAllForAndroid = () => {
+  if (!isAndroidClient || androidPreloadStarted) return
+  const urls = [
+    props.page?.img1,
+    props.page?.img2,
+    ...(props.page?.images || []),
+  ].filter(Boolean)
+  if (!urls.length) return
+  androidPreloadStarted = true
+  // 错开下载，避免同时抢占首屏网络
+  urls.forEach((url, i) => {
+    setTimeout(() => {
+      const img = new Image()
+      img.decoding = 'async'
+      img.src = url
+    }, 800 + i * 120)
+  })
+}
+
 const runNineSequential = async () => {
   const total = (props.page.images || []).length
   const { cancelled } = await seq.run({
@@ -378,6 +406,7 @@ watch(
 
 onMounted(() => {
   if (!props.nineGridAnimate) preloadNineGridImages()
+  preloadAllForAndroid()
   if (SEQUENTIAL_SELF_TYPES.has(props.page?.type)) bindMultiObserver()
 })