App 2.33.0: set the drive mode from Settings, only in P at a standstill

The owner lifted the read-only rule for the drive mode alone. Settings
has Eco, Normal, Sport, Snow and Custom; the lit button is what the car
reports. A tap reads gear and speed fresh and writes only in P at 0 km/h
(DriveModeWrite, unit-tested; unreadable is a refusal), through a CPM-only
write behind EVHardware's standstill gate, then reads the mode back and
says what the car reports. The wide layout's charging price joined the
battery card so the page still fits. Not tried on the car.

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

README.md

@@ -84,7 +84,7 @@ with the server using a token of its own, obtained by pairing with a phone (belo
 | **Charging** | The current session (SOC, voltage, current, power, energy into the battery and from the grid, time, cost) and its SOC/power curve |
 | **Live data** | Live data on/off, ABRP credentials for sending directly from the car, upload frequency |
 | **Server** | Server URL, pairing by QR code, ingest token, installation ID, config import |
-| **Settings** | Full screen, voice key, tyre pressure unit, accent colour, battery (manual SoH, usable capacity), charging price, entry on the phone, version, update check, install from USB stick, About |
+| **Settings** | Drive mode (Eco, Normal, Sport, Snow, Custom: changes only in P at a standstill; the highlighted one is what the car reports), full screen, voice key, tyre pressure unit, accent colour, battery (manual SoH, usable capacity), charging price, entry on the phone, version, update check, install from USB stick, About |
 | **Logs** | Update log (every install step), upload log |
 
 - **Opening the app:** the MG4 launcher does not list third-party apps. **Double-press the