Pin how Save of a placement edit merges by field

On a server that merges by field, Save names only the spots the user
dragged, measured from the version the edit started from: the user's
drag wins over a teammate's move of that spot, and the teammate's move
of another spot the edit held back stays. The test that Save waits as a
conflict now says it runs on a server that checks whole groups.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
b8c3f3026cDara Adedeji committed on 10/10/2026, 3:24:00 PMparente314496

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