docs: add mocked OBD-II dashboard screenshots

Render the real Home layout with a simulated 82 km/h, 34% throttle, 7.4 L/100 km and 17 C OBD state at 1280x720 and 1280x800. The mock build was temporary and was not committed.

README.md

@@ -31,6 +31,8 @@ Also: [Home with top-right Settings](docs/screenshots/home-16.png) ·
 [Now playing](docs/screenshots/home-now-playing.png) ·
 [1280×720](docs/screenshots/home-1280x720.png) ·
 [GPS speed](docs/screenshots/home-gps-speed.png) ·
+[Mocked OBD · 1280×720](docs/screenshots/home-obd-mock-1280x720.png) ·
+[Mocked OBD · 1280×800](docs/screenshots/home-obd-mock-1280x800.png) ·
 [Night mode](docs/screenshots/home-night-mode.png) ·
 [Blue accent](docs/screenshots/settings-blue-accent.png) ·
 [user-app icon on Home](docs/screenshots/home-user-icon.png) ·
@@ -39,6 +41,10 @@ Also: [Home with top-right Settings](docs/screenshots/home-16.png) ·
 [PIN lock](docs/screenshots/pin-lock.png) ·
 [1024×600 layout](docs/screenshots/home-compact-1024.png)
 
+The two **Mocked OBD** images are documentation renders with a simulated
+adapter state (82 km/h, 34% throttle, 7.4 L/100 km, Outside 17°C). They are not
+live vehicle data.
+
 ## Features
 
 - **One home screen** — no pages, no top bar, no bottom dock; information and