Hand photo curation back to the user as a ranked folder

When a user keeps rejecting automated choices about which photos make a montage segment, stop iterating renders. Export every candidate into one folder, named with a rank prefix ("01 - short description.jpg"), plus a _RANKING.txt giving a one-line reason per photo, and flag near-duplicates by cross-referencing their rank numbers. Re-check those cross-references after the final ordering, since they go stale easily. Then let the user delete or list numbers. Pair this with the time math (segment seconds / photo count) so they see the trade-off between count and on-screen time.