New components/LiveView.tsx renders the default landing at "/": full-bleed
MapView (rail + legend from chunk 5) plus a new TimeScrubber strip below
it — real call-density bars over the selected 1h/6h/24h/7d window, tinted
by the worst severity in each bucket, playhead pinned to NOW. The playhead
doesn't scrub yet; that needs `resolved_at` on incidents, which doesn't
exist server-side (blocked chunk 13, in DEFERRED.md) — the density data
itself is live, not a fixture.
Distinguishes the two empty states UI_REDESIGN.md §4 calls out: a
configured-but-quiet org (nodes online, zero active incidents) now shows
"Listening — last check-in Xm ago" instead of rendering nothing, separate
from the zero-node case (chunk 10's Activation screen).
app/page.tsx's HomePage now renders LiveView directly for a signed-in,
provisioned user instead of the chunk-4 interim redirect to /incidents.
Per UI_REDESIGN.md chunk 6.
