Payload of a companion.ui_update event — a live change to an
already-rendered Instant UI panel: write each { key, value } into the
panel's state bag (re-evaluating templates / progress / when), without
rebuilding. panelId targets one of several on-screen panels when present.
Payload of a
companion.ui_updateevent — a live change to an already-rendered Instant UI panel: write each{ key, value }into the panel's state bag (re-evaluating templates / progress /when), without rebuilding.panelIdtargets one of several on-screen panels when present.