fix: use shared downloadMedia utility in output nodes

- OutputGalleryNode: replace hardcoded .png/.mp4 download with shared
  downloadMedia utility for correct MIME-based extensions
- OutputNode: wrap downloadMedia call in try/catch to prevent unhandled
  rejection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/nodes/OutputGalleryNode.tsx

@@ -8,6 +8,7 @@ import { useWorkflowStore } from "@/store/workflowStore";
 import { OutputGalleryNodeData } from "@/types";
 import { useAdaptiveImageSrc } from "@/hooks/useAdaptiveImageSrc";
 import { defaultNodeDimensions } from "@/store/utils/nodeDefaults";
+import { downloadMedia as downloadMediaUtil } from "@/utils/downloadMedia";
 
 type MediaItem = { type: "image" | "video"; src: string };
 
@@ -67,14 +68,9 @@ export function OutputGalleryNode({ id, data, selected }: NodeProps<OutputGaller
     const item = displayMedia[lightboxIndex];
     if (!item) return;
 
-    const link = document.createElement("a");
+    downloadMediaUtil(item.src, item.type).catch((err) =>
-    link.href = item.src;
+      console.error("Gallery download failed:", err)
-    link.download = item.type === "video"
+    );
-      ? `gallery-video-${lightboxIndex + 1}.mp4`
-      : `gallery-image-${lightboxIndex + 1}.png`;
-    document.body.appendChild(link);
-    link.click();
-    document.body.removeChild(link);
   }, [lightboxIndex, displayMedia]);
 
   const removeMedia = useCallback((index: number) => {

src/components/nodes/OutputNode.tsx

@@ -76,7 +76,11 @@ export function OutputNode({ id, data, selected }: NodeProps<OutputNodeType>) {
   const handleDownload = useCallback(async () => {
     if (!contentSrc) return;
     const type: MediaType = isAudio ? "audio" : isVideo ? "video" : "image";
-    await downloadMedia(contentSrc, type, nodeData.outputFilename ?? undefined);
+    try {
+      await downloadMedia(contentSrc, type, nodeData.outputFilename ?? undefined);
+    } catch (err) {
+      console.error("Download failed:", err);
+    }
   }, [contentSrc, isAudio, isVideo, nodeData.outputFilename]);
 
   return (