Show which filters generated a list of leads

Requested by Treg (Lucky Growth) via Kalkidan on a customer call. Currently there is no way to see, after the fact, which Lead Finder filters/criteria were used to produce a given list or sheet of leads. Users want to view the exact filter set that generated a specific list, so they can reproduce or tweak the search later.

Related to but distinct from "Save the searches in Lead Finder" (reuse for future searches) and "Save Filter Settings as Template" (templating) which are about saving filters going forward, not viewing what was used historically.