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Cards: export_card (CSV/XLSX/JSON), create_model (type=model para fuentes MBQL). Documents: prosemirror_card_embed helper (resizeNode envolviendo cardEmbed), validacion automatica contra whitelist TipTap antes de enviar, copy_document refactorizado al endpoint nativo POST /api/document/:id/copy. Docs: dataset_query legacy vs MBQL5, template-tags, whitelist de nodos. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>