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Photos can now be dragged to any position — cursor changes to a move cursor to signal draggability, the drop target dims to show the insertion point, and the list rebuilds immediately after the drop. First photo gets a 'Cover' badge since eBay uses it as the gallery hero image. All add/remove/clear operations now go through RebuildPhotoThumbnails() so the panel always reflects the true order in PhotoPaths. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>