Show more info on finished stack label

When I run stacks, the label under the thumbnail doesn't give much info to distinguish them. For example, I ran two stacks of the same images and set them to different Looks but the labels are identical.

Maybe we should put the base filename info (that would be used if you Saved the files) as the caption under each thumbnail? So something like "bee - 2026-07-30 20.27.04 MS Enh-60".

And then maybe we don't need the "Stack" label in there.