How a demo behaves depends on how much of a list fits on the screen, and
`just e2e` ran demos on a 150x100 screen while we record them at 120x35.
So a demo could pass the test suite and still fail partway through a
recording, and there was no way to find out short of recording it.
Give a demo the recording size when it doesn't ask for a size of its
own.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>