App 2.22.3: rename the Overview style Dashboard to Gauges

The stored value becomes GAUGES; DASHBOARD still selects it.

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

SPECS.md

@@ -131,6 +131,10 @@ 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).
+- 2026-10-24 — App 2.22.3: the Overview style "Dashboard" is now called "Gauges" (stored as
+  `GAUGES`; the old value `DASHBOARD` still selects it, so the choice survives the update;
+  `pane_dashboard.xml` is `pane_gauges.xml`). The branches `dashboard-gauges` and
+  `dashboard-cockpit`, merged into main, are deleted. Tests and lint.
 - 2026-10-24 — App 2.22.2 (branch `dashboard-cockpit`): the gear badge names all four gears.
   The owner shifted through the lever with 2.22.1 and read the codes off the Logs tab: 1 P,
   2 R, 3 N, 4 D (firmware SWI68-29958-1300R69). `Gear.label` maps them (unit-tested); any