Holiday border bug

When using wired CarPlay, the holiday border (in full-screen mode) often switches to half-screen, leaving it in the middle of the screen.

Start by reproducing the issue with wired CarPlay while the holiday border is in full-screen mode. Trace the code responsible for switching the border between full-screen and half-screen; done means the border remains full-screen instead of appearing in the middle of the screen. No file or test is identified in the issue, so the relevant entry point must be located first.

Written by the indexing model from the issue text.