Head unit is 1920x720, not 1920x1080

FIRMWARE.md, the mise emulator profile and SPECS.md said 1920x1080.
The MG4's display is 1920x720 at 160 dpi (an app window has been seen
at 1778x720, the car's sidebar taking the rest). The floating button's
geometry test now uses 1920x720.

The app itself assumed no height: checked on an Android 9 emulator at
1920x720, all tabs render (longer ones scroll), the sidebar holds all
seven tabs, and the floating button starts at 1840,312.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

SPECS.md

@@ -117,7 +117,8 @@ tyre pressures, GPS (lat, lon, elevation, heading) and the is_* flags. It does *
 - 2026-10-17 — App 2.6.0: floating button to open the app, because the MG4 launcher does not list
   it. Drawn over other apps (needs the overlay permission, which the car build has through the
   system UID), draggable, hidden while the app is open, switch in the Upload tab. Tested on an
-  Android 9 AOSP emulator at 1920x1080/160 dpi with the car APK (installs as UID 1000 there too).
+  Android 9 AOSP emulator with the car APK (installs as UID 1000 there too), at 1920x1080 and at the
+  head unit's real 1920x720 / 160 dpi, where all tabs and the button were checked as well.
 - 2026-10-17 — App 2.5.0: range estimates at current and 5-minute average power (Vehicle tab).
 - 2026-10-17 — Live dashboard reworked around the signals the car sends: Climate setpoint, Last
   update and a computed Energy in pack replace the empty temperature tiles; Battery voltage and