Issue #3618112: Say nothing when the engine rearranges its own choices, since the booker named no place

Silences "Your places have moved so that you can sit together." on both sites that raised it, the placement that gave up a place and the consolidation that runs after every change. A booker asking for a quantity names no place, so exchanging some of the engine's own choices for others is bookkeeping rather than news, and on a release the sentence misdescribed the booker's own gesture.

What still speaks is unchanged: how close together the party ended up, fewer places held than asked for, and a move into an area the booker asked for. A place picked on the plan is never moved at all, which is what makes the silence safe.

AI-Generated: Yes (Claude Code wrote the code, the test, the documentation and the translation changes on this merge request, from a rule the maintainer set out. I reviewed and ran them before pushing.)