2026 03 28 Render Url Videos Media Node

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• media-video-node: Render plain video URLs with ReactPlayer when the node has a url and no upload flag.

<!-- entry: {"id":"2026-03-28-29-5-editor-ai-sync-registry-blocks-url-9e2b12ab","kind":"behavior","migrationNotes":[]} -->

• editor-ai, editor-basic, slate-to-html: Sync registry blocks with the URL video rendering path.