Optional badge field (priority, severity, rating)
Optional description/summary field
Ordered display fields for the card body
Map of field names to display labels
Optional subtitle field (status, type, category)
Thumbnail field names in priority order (image URL or icon class)
Field names that form the card title, in display order. Multiple IsNameField fields are combined (e.g., ["FirstName", "LastName"] → "Elizabeth Rodriguez").
Describes how a card should be laid out — which fields map to which visual slots. Auto-generated from entity metadata when not provided.