DeviceWhisper: a compact live panel in the séance side column, shown only
when the seeker has paired hardware. One DeviceFeedSocket, readings folded
through the coldSpot cores, online dot with a 15s tick so a silent device
goes dark, cold-spot/pressure flags when active. Renders nothing on zero
devices or any fetch failure — the séance never errors because of this
panel. Socket closed on unmount.
Uses the real GET /api/device endpoint — the spec said /api/devices,
which does not exist; the agent verified against routes/device.py rather
than trusting the spec.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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