fix(skill): use downloadUrl utility instead of window.open for file downloads

Replaces window.open with the downloadUrl helper from utils/download.ts
to trigger proper browser download behavior via <a download> instead of
opening a new tab that may display garbled content.

web/app/components/workflow/skill/hooks/use-download-operation.ts

@@ -1,21 +1,22 @@
 'use client'
 
-// Handles file download operation - opens download URL in new tab
-
 import { useCallback, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import Toast from '@/app/components/base/toast'
 import { consoleClient } from '@/service/client'
+import { downloadUrl } from '@/utils/download'
 
 type UseDownloadOperationOptions = {
   appId: string
   nodeId: string
+  fileName?: string
   onClose: () => void
 }
 
 export function useDownloadOperation({
   appId,
   nodeId,
+  fileName,
   onClose,
 }: UseDownloadOperationOptions) {
   const { t } = useTranslation('workflow')
@@ -25,7 +26,6 @@ export function useDownloadOperation({
     if (!nodeId || !appId)
       return
 
-    // Close menu immediately before any async operation
     onClose()
 
     setIsDownloading(true)
@@ -34,9 +34,7 @@ export function useDownloadOperation({
         params: { appId, nodeId },
       })
 
-      // Open download URL in new tab (consistent with UnsupportedFileDownload)
-      if (typeof window !== 'undefined')
-        window.open(download_url, '_blank', 'noopener,noreferrer')
+      downloadUrl({ url: download_url, fileName })
     }
     catch {
       Toast.notify({
@@ -47,7 +45,7 @@ export function useDownloadOperation({
     finally {
       setIsDownloading(false)
     }
-  }, [appId, nodeId, onClose, t])
+  }, [appId, nodeId, fileName, onClose, t])
 
   return {
     handleDownload,

web/app/components/workflow/skill/hooks/use-file-operations.ts

@@ -55,6 +55,7 @@ export function useFileOperations({
   const downloadOps = useDownloadOperation({
     appId,
     nodeId,
+    fileName: node?.data.name,
     onClose,
   })
 

web/app/components/workflow/skill/viewer/unsupported-file-download.tsx

@@ -4,6 +4,7 @@ import { useTranslation } from 'react-i18next'
 import Button from '@/app/components/base/button'
 import FileTypeIcon from '@/app/components/base/file-uploader/file-type-icon'
 import { FileAppearanceTypeEnum } from '@/app/components/base/file-uploader/types'
+import { downloadUrl as triggerDownloadUrl } from '@/utils/download'
 import { formatFileSize } from '@/utils/format'
 
 type UnsupportedFileDownloadProps = {
@@ -17,10 +18,10 @@ const UnsupportedFileDownload = ({ name, size, downloadUrl }: UnsupportedFileDow
   const fileSize = size ? formatFileSize(size) : ''
 
   const handleDownload = useCallback(() => {
-    if (!downloadUrl || typeof window === 'undefined')
+    if (!downloadUrl)
       return
-    window.open(downloadUrl, '_blank', 'noopener,noreferrer')
-  }, [downloadUrl])
+    triggerDownloadUrl({ url: downloadUrl, fileName: name })
+  }, [downloadUrl, name])
 
   return (
     <div className="flex h-full w-full items-center justify-center">