fix(GBTaskCard): 修正下载合成视频文件后缀 .webm > .mp4

components/aigc/generation/GBTaskCard.vue

@@ -130,7 +130,7 @@ const downloadCompositedVideo = () => {
   const url = URL.createObjectURL(compositedVideoBlob.value)
   const link = document.createElement('a')
   link.href = url
-  link.download = `${props.video.title || props.video.task_id}_合成.webm`
+  link.download = `${props.video.title || props.video.task_id}_composited.mp4`
   document.body.appendChild(link)
   link.click()
   document.body.removeChild(link)