[polaris.shopify.com] Feedback (on /components/layout-and-structure/callout-card?example=callout-card-default)

[javl]

The button in the CalloutCard does not have a loading attribute to show a spinner while working, which I think would be useful in a lot of cases.

edit: the same is true for the MediaCard actually. Both elements can show buttons but you can't provide 'processing' feedback when they are clicked.