Offering cards collapse while images loading

[zkat]

[skullbunnygalaxy]

Played around with intentionally causing this, and it appears the issue happens when the blur hasn't loaded, ie the behavior doesn't happen when you remove the image, but if the image is loaded and the blur is removed, it happens.

[skullbunnygalaxy]

My recommendation for fixing this relies on #610. Once this is implemented, we can pull the dominant color to create a placeholder to quickly load first. Relevant link for implementation: https://github.com/libvips/libvips/issues/259