4e8be6a684
Transit shelf registration is effectively an off-shelf operation. Allow not_shelved, on_shelf, and their mix when target is a transit shelf. Only transferred items are blocked since they are already in transit. Also fix conflict color logic: transferred items now correctly show as red (conflict) for both transit and normal shelf targets. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>