The SW4RM tab rendered a per-transient spinner list above the container
list, duplicating the running-step badge already shown on each agent card.
Replace it with a single compact amber banner that appears when the rebuild
queue has active (queued/running) entries — 'build queue — N running / M
queued — view queue →', linking to the full queue on /core.html. Per-agent
detail stays on the cards; the top of the tab just gives the at-a-glance
summary + a jump to the queue. Closes#1817.
6bb976ec72