Use cloud and Keep both reloaded the whole page to show the cloud's
version, which closed Edit placement and threw away its drags even when
the conflict was on another lineup. Teammates' changes already apply item
by item (#208); conflict resolution now goes the same way, holding what
the user has open except what they chose the cloud's version of. A
placement edit of a lineup in the conflict ends.

This replaces the earlier commits' reopen-after-reload logic in the lineup
provider and editor, which go back to #265's versions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>