Small rebase onto main (4 commits). The composer stash-shortcut label
and the mobile start-task menu refactor merged onto the v2 composer
bodies, and main's new auto-settle list tests are ported to the v2
thread-list test file (latestRun/RunId shapes). The auto-settle
machinery itself already matched main from the round-11 reconcile.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>