fix: 修复点击下载只跳转不下载问题

src/views/paper/question/CdesignForm.vue

@@ -729,9 +729,45 @@ const downloadFile = async (url: string) => {
     return
   }
   try {
-    window.open(url, '_blank')
+    // 获取文件信息
+    const fileItem = formData.value.fileUploads.find((i) => i.url === url)
+    const fileName = fileItem?.fileName || '下载文件'
+
+    // 使用 fetch 获取文件
+    const response = await fetch(url)
+    if (!response.ok) {
+      throw new Error(`HTTP error! status: ${response.status}`)
+    }
+
+    // 获取文件内容
+    const blob = await response.blob()
+
+    // 创建对象URL
+    const objectUrl = URL.createObjectURL(blob)
+
+    // 创建下载链接
+    const link = document.createElement('a')
+    link.href = objectUrl
+    link.download = fileName
+    link.style.display = 'none'
+
+    // 触发下载
+    document.body.appendChild(link)
+    link.click()
+
+    // 清理
+    document.body.removeChild(link)
+    URL.revokeObjectURL(objectUrl)
+
+    message.success('文件下载成功')
   } catch (err: any) {
-    message.error(`下载失败：${err.message}`)
+    console.error('Download error:', err)
+    // 如果 fetch 下载失败，回退到直接打开链接
+    try {
+      window.open(url, '_blank')
+    } catch (openError) {
+      message.error(`下载失败：${err.message}`)
+    }
   }
 }