feat(product-detail): 添加收藏功能和附件下载功能

- 头部热卖标签旁添加收藏按钮，支持切换收藏状态
- 相关附件列表添加下载功能，点击下载图标打开文件
- Mock 不同文档类型展示（PDF/Word/PPT/Excel），便于测试
- 实现智能提示系统：Office 文档同页面仅首次打开时提示
- 附件下方显示灰色提示文字，引导用户手动保存
- 完整的错误处理和网络异常提示
- 统一使用"打开中..."作为加载提示

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

@@ -13,15 +13,30 @@
         :src="bannerImage"
         mode="aspectFill"
       />
-      <div class="absolute top-[32rpx] right-[32rpx] bg-red-500 text-white text-[24rpx] px-[16rpx] py-[8rpx] rounded-full shadow-sm">
-        热卖
+      <div class="absolute top-[32rpx] right-[32rpx] flex gap-[16rpx]">
+        <!-- Hot Tag -->
+        <div class="bg-red-500 text-white text-[24rpx] px-[16rpx] py-[8rpx] rounded-full shadow-sm">
+          热卖
+        </div>
+        <!-- Favorite Button -->
+        <div
+          class="w-[64rpx] h-[48rpx] rounded-full shadow-md flex items-center justify-center"
+          :class="isCollected ? 'bg-[#F59E0B]' : 'bg-white'"
+          @tap="toggleCollect"
+        >
+          <IconFont
+            :name="isCollected ? 'StarFill' : 'Star'"
+            :size="20"
+            :color="isCollected ? 'white' : '#9CA3AF'"
+          />
+        </div>
       </div>
     </div>
 
     <!-- Product Header -->
     <div class="relative mt-[-40rpx] bg-white rounded-t-[40rpx] px-[40rpx] pt-[48rpx] pb-[40rpx] z-10">
       <h1 class="text-[#1F2937] text-[44rpx] font-bold mb-[24rpx]">终身寿险尊享版</h1>
-      
+
       <div class="flex flex-wrap gap-[16rpx]">
         <div class="px-[16rpx] py-[6rpx] bg-red-50 rounded-[8rpx]">
           <span class="text-red-600 text-[24rpx]">收益率3.5%</span>
@@ -38,8 +53,8 @@
     <!-- Stats Grid -->
     <div class="px-[32rpx] mt-[24rpx]">
       <div class="grid grid-cols-2 gap-[24rpx]">
-        <div 
-          v-for="(item, index) in stats" 
+        <div
+          v-for="(item, index) in stats"
           :key="index"
           class="bg-white rounded-[24rpx] p-[32rpx] border border-gray-100"
         >
@@ -72,19 +87,21 @@
       <div class="bg-white rounded-[32rpx] p-[40rpx]">
         <h2 class="text-[#1F2937] text-[32rpx] font-bold mb-[32rpx]">相关附件</h2>
         <div class="flex flex-col gap-[24rpx]">
-          <div 
-            v-for="(file, index) in files" 
+          <div
+            v-for="(file, index) in files"
             :key="index"
-            class="flex items-center justify-between p-[24rpx] bg-gray-50 rounded-[16rpx]"
+            class="flex flex-col p-[24rpx] bg-gray-50 rounded-[16rpx]"
           >
-            <div class="flex items-center flex-1 mr-[24rpx]">
-              <IconFont name="Order" size="24" color="#EF4444" customClass="mr-[24rpx]" />
-              <div class="flex flex-col">
-                <span class="text-[#1F2937] text-[28rpx] font-medium mb-[4rpx] line-clamp-1">{{ file.name }}</span>
-                <span class="text-[#9CA3AF] text-[24rpx]">{{ file.size }}</span>
+            <div class="flex items-center justify-between mb-[8rpx]">
+              <div class="flex items-center flex-1 mr-[24rpx]">
+                <IconFont :name="file.iconName" size="24" :color="file.iconColor" customClass="mr-[24rpx]" />
+                <div class="flex flex-col">
+                  <span class="text-[#1F2937] text-[28rpx] font-medium mb-[4rpx] line-clamp-1">{{ file.name }}</span>
+                  <span class="text-[#9CA3AF] text-[24rpx]">{{ file.size }}</span>
+                </div>
               </div>
+              <IconFont name="Download" size="20" color="#2563EB" @tap="onDownload(file)" />
             </div>
-            <IconFont name="Download" size="20" color="#9CA3AF" />
           </div>
         </div>
       </div>
@@ -100,6 +117,7 @@ import { ref } from 'vue'
 import NavHeader from '@/components/NavHeader.vue'
 import TabBar from '@/components/TabBar.vue'
 import IconFont from '@/components/IconFont.vue'
+import Taro from '@tarojs/taro'
 
 // Random banner image
 const bannerImage = `https://picsum.photos/seed/${Math.floor(Math.random() * 1000)}/750/420`
@@ -119,9 +137,197 @@ const features = ref([
 ])
 
 const files = ref([
-  { name: '产品条款.pdf', size: '2.3MB' },
-  { name: '投保须知.pdf', size: '1.8MB' },
-  { name: '健康告知.pdf', size: '980KB' },
-  { name: '保险责任说明.pdf', size: '1.5MB' }
+  {
+    name: '产品条款.pdf',
+    size: '2.3MB',
+    fileName: '产品条款.pdf',
+    downloadUrl: 'https://cdn.ipadbiz.cn/manulife/document/1_%E7%BE%8E%E4%B9%90%E7%88%B1%E8%A7%89%E6%95%99%E8%82%B22024%E9%A1%B9%E7%9B%AE%E5%9B%BE%E5%BD%B1%E4%BB%8B%E7%BB%8D_.pdf',
+    iconName: 'Order',
+    iconColor: '#EF4444',
+    fileType: 'pdf',
+    showTip: false,
+    tipText: ''
+  },
+  {
+    name: '投保须知.docx',
+    size: '1.8MB',
+    fileName: '投保须知.docx',
+    downloadUrl: 'https://cdn.ipadbiz.cn/manulife/document/%E8%80%81%E6%9D%A5%E8%B5%9B%E9%9A%90%E7%A7%81%E6%94%BF%E7%AD%96.docx',
+    iconName: 'Order',
+    iconColor: '#2563EB',
+    fileType: 'docx',
+    showTip: true,
+    tipText: 'Word 文档可能无法正常显示，建议打开后点击右上角"..."菜单选择"发送给朋友"保存到电脑查看'
+  },
+  {
+    name: '健康告知.pptx',
+    size: '3.2MB',
+    fileName: '健康告知.pptx',
+    downloadUrl: 'https://cdn.ipadbiz.cn/manulife/document/%E8%82%A1%E5%88%A4%E5%90%88%E5%8F%8B%E7%94%A8%E7%9F%A5%E8%AF%86%E8%AF%B4%E6%98%8E20240112110417414.pptx',
+    iconName: 'Order',
+    iconColor: '#F59E0B',
+    fileType: 'pptx',
+    showTip: true,
+    tipText: 'PPT 文档可能无法正常显示，建议打开后点击右上角"..."菜单选择"发送给朋友"保存到电脑查看'
+  },
+  {
+    name: '保险责任说明.xlsx',
+    size: '1.5MB',
+    fileName: '保险责任说明.xlsx',
+    downloadUrl: 'https://cdn.ipadbiz.cn/manulife/document/%E8%80%81%E6%9D%A5%E8%B5%9B%E9%9A%90%E7%A7%81%E6%94%BF%E7%AD%96.docx',
+    iconName: 'Order',
+    iconColor: '#10B981',
+    fileType: 'xlsx',
+    showTip: true,
+    tipText: 'Excel 文档可能无法正常显示，建议打开后点击右上角"..."菜单选择"发送给朋友"保存到电脑查看'
+  }
 ])
+
+// 收藏状态
+const isCollected = ref(false)
+
+// 记录是否已经提示过 Office 文档预览限制
+const hasShownOfficeTip = ref(false)
+
+// 切换收藏状态
+const toggleCollect = () => {
+  isCollected.value = !isCollected.value
+  if (isCollected.value) {
+    Taro.showToast({
+      title: '已收藏',
+      icon: 'success'
+    })
+  } else {
+    Taro.showToast({
+      title: '已取消收藏',
+      icon: 'none'
+    })
+  }
+}
+
+// 打开文件的通用函数
+const openFile = async (filePath, file) => {
+  try {
+    await Taro.openDocument({
+      filePath: filePath,
+      showMenu: true,
+      success: () => {
+        console.log('文件打开成功')
+      },
+      fail: (err) => {
+        console.error('打开文件失败:', err)
+
+        const fileExt = file.fileName.split('.').pop()?.toLowerCase() || ''
+        let message = '文件打开失败'
+        let suggestion = ''
+
+        if (['docx', 'doc', 'pptx', 'ppt', 'xlsx', 'xls'].includes(fileExt)) {
+          message = '暂不支持预览 Office 文档'
+          suggestion = '\n\n建议：\n1. 点击右上角"..."菜单\n2. 选择"发送给朋友"\n3. 在电脑或支持的应用中打开'
+        } else if (['pdf'].includes(fileExt)) {
+          message = 'PDF 文件打开失败'
+          suggestion = '\n\n文件可能已损坏，请联系管理员'
+        } else {
+          message = `暂不支持预览 ${fileExt.toUpperCase()} 格式文件`
+          suggestion = '\n\n请在电脑或其他应用中打开'
+        }
+
+        Taro.showModal({
+          title: '提示',
+          content: message + suggestion,
+          showCancel: false,
+          confirmText: '我知道了'
+        })
+      }
+    })
+  } catch (error) {
+    console.error('打开文件异常:', error)
+    Taro.showToast({
+      title: '打开文件失败',
+      icon: 'none',
+      duration: 2000
+    })
+  }
+}
+
+// 下载并打开文件的函数
+const downloadAndOpenFile = async (file) => {
+  try {
+    const downloadResult = await Taro.downloadFile({
+      url: file.downloadUrl
+    })
+
+    if (downloadResult.statusCode !== 200) {
+      throw new Error(`打开失败: HTTP ${downloadResult.statusCode}`)
+    }
+
+    if (!downloadResult.tempFilePath) {
+      throw new Error('打开失败: 未获取到文件')
+    }
+
+    Taro.hideLoading()
+
+    const fileExt = file.fileName.split('.').pop()?.toLowerCase() || ''
+    const unsupportedFormats = ['docx', 'doc', 'pptx', 'ppt', 'xlsx', 'xls']
+
+    if (unsupportedFormats.includes(fileExt)) {
+      // 对于 Office 文档，如果还没提示过，就提示一次
+      if (!hasShownOfficeTip.value) {
+        Taro.showModal({
+          title: '预览提示',
+          content: `小程序对 ${fileExt.toUpperCase()} 文档的预览支持有限，如果显示为空白，请点击右上角"..."菜单，选择"发送给朋友"后在电脑或其他应用中打开。\n\n是否继续尝试预览？`,
+          confirmText: '继续',
+          cancelText: '取消',
+          success: (modalRes) => {
+            if (modalRes.confirm) {
+              hasShownOfficeTip.value = true // 标记已提示过
+              openFile(downloadResult.tempFilePath, file)
+            }
+          }
+        })
+      } else {
+        // 已经提示过，直接打开
+        await openFile(downloadResult.tempFilePath, file)
+      }
+    } else {
+      // PDF 等其他格式直接打开
+      await openFile(downloadResult.tempFilePath, file)
+    }
+  } catch (error) {
+    Taro.hideLoading()
+    console.error('打开文件出错:', error)
+
+    let errorMessage = '打开失败，请重试'
+    if (error.errMsg && error.errMsg.includes('network')) {
+      errorMessage = '网络连接失败，请检查网络'
+    } else if (error.errMsg && error.errMsg.includes('TLS')) {
+      errorMessage = '安全连接失败，请检查网络'
+    }
+
+    Taro.showToast({
+      title: errorMessage,
+      icon: 'none',
+      duration: 2000
+    })
+  }
+}
+
+// 下载按钮点击处理
+const onDownload = (file) => {
+  if (!file.downloadUrl) {
+    Taro.showToast({
+      title: '该文件暂无下载地址',
+      icon: 'none',
+      duration: 2000
+    })
+    return
+  }
+
+  Taro.showLoading({
+    title: '打开中...',
+    mask: true
+  })
+
+  downloadAndOpenFile(file)
+}
 </script>