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Visible layout of an app card. Mirrors Apple’s MSMessageTemplateLayout (the iMessage mini-app surface) — the iMessage provider renders it natively; other platforms ignore it and fall back to the bare URL. At least one of caption, subcaption, trailingCaption, trailingSubcaption, or image must be set so the bubble is not empty — summary is the fallback text shown on surfaces that cannot render the card and is not a visible slot on its own. image and imageTitle must be set together; imageSubtitle requires image.