App 2.19.7: meter AC charging too, while the app runs

A session runs whenever power flows into the pack, AC or DC; gaps the
head unit slept through are dropped as before. Dashboard and server
texts no longer say DC only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

SPECS.md

@@ -118,6 +118,14 @@ tyre pressures, GPS (lat, lon, elevation, heading) and the is_* flags. It does *
   confirmed car facts, app structure, UI conventions, build/test/ship, documents. It replaces
   upstream's EVABRPUploader text. The test emulator is now in the flake: `nix run .#car-emulator`
   (Android 9 AOSP at 1920×720, 160 dpi; the car build installs as the system user — checked).
+- 2026-10-23 — App 2.19.7: AC charging is metered too, while the app runs (owner's choice; Fatih
+  had metered DC only, `e9bfa12`, because an overnight AC charge is slept through). A session runs
+  whenever power flows into the pack (`ChargingState.isMeteredCharging`: inbound > 0.3 kW and a
+  charge by `isCharging`), and its curve takes every inbound sample. Gaps where the head unit
+  slept are dropped, not billed, so an overnight AC session shows the awake part only. The label
+  says "AC charging" / "DC fast charging"; `isDcCharging` stays for it and ABRP's `is_dcfc`. Server
+  comment, server README and the Grafana charging dashboard's texts no longer say DC only (the
+  dashboard ConfigMap changes with them: re-apply `k8s/`). Unit tests; not tried on the car.
 - 2026-10-23 — App 2.19.6: the CarPlay full-screen switch and the "Export CarPlay data" button are
   removed (CarPlay's size is fixed, see below). On start, the car build takes the CarPlay entry out
   of `policy_control` if the switch was left on, and leaves anything else there alone — checked on