Google Play rejected 2.16.0 (versionCode 142) for an Android Automotive
navigation dead end: on a car, "Sign in with Plex" resolves to the
in-app QR wait, which offered only Retry — and the AAOS system bar has
no back button, so a touch user could not leave the screen without
killing the app. Add a Cancel action to the QR and browser-polling
states that aborts the attempt and returns to the initial sign-in
actions on every platform.
Verified on an API 34 Automotive emulator: Cancel returns to the
landing with the Jellyfin/Emby paths reachable.