Workstream D of the usability wave (#8). A compact live panel in the
séance side column, shown only when the seeker has paired hardware:
device name, online dot (reading within 60s), latest readings in the
terminal readout style, and cold-spot / pressure-anomaly flags from the
lib/coldSpot.ts cores. Fetches GET /api/device once on mount; renders
nothing on zero devices or fetch failure — the séance never sees an
error from this panel. Socket closed on unmount.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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