App 2.25.0: Overview style MG, octagonal dials

After the classic MG dashboards: three octagonal dials with chrome
bezels, cream scales and accent-coloured needles for speed, battery and
power, and a cream line of odometer, trip, usage, climate and clock.
No MG logo. Emulator only.

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

SPECS.md

@@ -131,6 +131,16 @@ 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 2.25.0 (branch `styles-retro-future`): Overview style "MG" (`OctagonView`),
+  after the classic MG dashboards whose dials sat in octagonal bezels — not a copy of the MG4's
+  own driver display, and without MG's octagon logo. Three octagonal dials with chrome bezels,
+  cream scales and needles in the accent colour: speed in the middle (digits and P R N D under
+  the hub), battery E…F on the left (red zone below 20 %, range), power −50…150 kW on the right
+  (green charge zone below zero). A cream line below: odometer, trip, 5-minute usage, climate,
+  clock, separated by small accent octagons. Needles ease and redraw only until settled, only
+  on screen; unread values draw no needle and "—". Palette `mg_*`. Checked on the emulator with
+  sample values (`screenshots/nilsmg4-2.25.0-mg.png`) and without data; no crash. Not tried on
+  the car.
 - 2026-10-24 — App 2.24.1 (branch `styles-retro-future`): the line of text above every page
   ("Your drive at a glance.", "Settings. Display, battery…" and so on) is gone, at the owner's
   request; the pages start at the top, level with the sidebar, and gain about 45 dp. Its 14