Object, weapon, lineup field and settings edits now replay by what they
actually change, like additions, deletions and clears already do. Each
compares the fields it writes with what the page holds now and returns
nothing when a teammate already put them there, so undo and redo move on
to the next step instead of spending the keypress on a write that changes
nothing. The entry for the opposite stack is built from the two states the
write actually joined.

LineUpProvider.replayEdit replaces replayLinkDetails and covers every lineup
field (positions, visibility toggles, link details). The target-exists check
and the settings writer it made redundant are removed.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>