- Add MetricGauge, RingGauge, MetricGaugeRow composables - Add MetricGaugeContract with SensorType enum and AQI color mapping - Add AQI colors (SensorGreen, SensorYellow, etc.) to theme - Copy ic_temperature, ic_humidity, ic_pressure drawables from legacy - Integrate MetricGaugeRow into DashboardScreen - Add 9 preview composables for portfolio readiness Made-with: Cursor