Glanceable state: tone gauges/progress rings, trend arrow + 1h delta, sparklines, activity dot, device icon set

Operator (2026-09-06): use colour graphs/gauges and icons to quickly convey states, trends, speeds, activity. Spec: ArcGauge triad + progress rings for fan %, lamp %, day-of-cycle; ▲/▼ 1h delta from history slope with deadband; 24h sparkline on every wide tile / on hover in compact; activity dot (teal <60s, grey-dashed held) with HELD tag; phase chip, lamp dot glow, alert badge, direction-of-pull glyphs; new stroke icons (fan, heat mat, lamp, dehum, humidifier, heater, mister, probe, CO2, PAR, vent, door, window, hub, plug) each with --on and --oos variants. Colour for state only.