Status bar: part lamps (CAN, OBD, IMU, CAM), drawn signal and battery icons

WiFi and LTE show signal in four steps with Android's traffic arrows; the battery is
filled to its level in good (charging), caution (under 40 %) or alarm (under 20 %).
OBD, IMU and CAM are lamps by CAN's rule; CAM reads orin-status' new cam_up and vision_up.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/impl/plans/DASH-NEXT.md

@@ -12,12 +12,21 @@ what the Orin publishes.
 
 ## 1. Orin status in a top banner, like a phone's
 
-**First cut (2026-10-15):** `widgets/status_bar.dart`, drawn by the shell over every view (the
+**Built (2026-10-15):** `widgets/status_bar.dart`, drawn by the shell over every view (the
 Dash's own top line is gone; its menu button moved in). Left: the menu (Dash only) and the
-link. Right: Orin temperature (only from 80 °C), CAN (alarm when absent or bus-off), OBD
-(only while the ELM is connected), GNSS fix icon and satellite count, LTE bars and
-technology (only with a modem), WiFi bars, UPS battery and % (caution on battery, alarm
-under 20 %), then the dark/bright button. Tapping the strip does nothing yet.
+link. Right:
+- Orin temperature, only from 80 °C.
+- Lamps for the parts, by one rule (foreground up, caution degraded, alarm down, subdued
+  unknown): CAN (`can_up`, bus state), OBD (`elm_connected`), IMU (its values fresh or
+  stale), CAM (`cam_up`, caution when `vision_up` is false; both new in orin-status).
+- GNSS fix icon and satellite count.
+- LTE (only with a modem) and WiFi: signal in four steps, Android's up/down traffic arrows
+  (lit above 2 kbit/s).
+- UPS battery, filled to its level: good while charging, caution under 40 %, alarm under
+  20 %, foreground otherwise.
+- The dark/bright button.
+
+Tapping the strip does nothing yet.
 What was asked:
 
 A thin strip across the top of the app (the Dash's own top line included) showing the Orin