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ComfyUI core (frontend 1.42.x) natively renders a node's `ui.gifs` output as a media preview, so our own JS preview widget produced a second one. Return the preview under a custom `universr_videos` key that core ignores; our web extension is now the only thing that renders it — single preview. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>