* feat(mod queue): transfer posts across boards
* fix(mod queue): polish transfer modal and reason
* fix(mod queue): recover abandoned transfer challenges
* fix(mod queue): address transfer review feedback
* fix(mod queue): hide transfer for unavailable posts
* fix(mod queue): prevent repeat transfer submit
* fix(mod queue): sync transfer state with queue actions
* fix(mod queue): omit transfer temp index
* fix(mod queue): harden transfer failure states
* fix(mod queue): keep hidden transfer lock
* fix(mod queue): release hidden transfer lock
