SetPreview cards should start out invisible
SetPreview cards should start out invisible

On the Hierarchical Set page, the SetPreviewCards
should start out as invisible. That way they will
not take up space on the page and the scroll view
will know to request more content. Only when we load
content on those set cards should we set them to
be visible.

https://phabricator.endlessm.com/T10707

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib