The status badge's elapsed-time text ('thinking Xm Ys') was computed
from Date.now() inside the render function, so it only ever advanced
when the component actually re-rendered. Two gaps let it go stale:
- useAgentState's poll loop is a chained setTimeout, which browsers
throttle (or suspend outright) once the tab is backgrounded, so
polling could stall for a long time with no way back to a live
reading short of a full page reload.
- even under healthy polling, the age text only advanced once every
~4s (the poll interval) instead of counting up smoothly.
Fix: resync immediately on visibilitychange (so returning to a
backgrounded tab doesn't leave a stale reading), and drive the age
text off its own 1s interval independent of the poll cadence.
9c72a4ae3e