Passed to Thumbnail by a card or the player, from the dump's rich content.
optional
src: string
The image's own URL, not proxied, since the fallbacks decide when to.
optional
alt: string
optional
className: string
Applies to the image only.
optional
loading: "lazy" | "eager"
sizes: number | string
The width the image is laid out at, as imageProps takes it. An image
the API serves, the site's own or a proxied one, then loads no larger
than that; another site's loads as that site sends it.
placeholder: Omit<ThumbnailPlaceholderProps, "className">
Shown when there's no src or it fails to load.
optional
placeholderClassName: string