The width, in CSS pixels, at and above which the lesson Player wears its
full chrome.
Remarks
Vidstack's own default also breaks on height — below 380px it switches to
the compact chrome — and a 16:9 player in the lesson column is about 360px
tall on a desktop, so every desktop learner would get the phone chrome.
Width alone is the project's rule; LessonVideoPlayer says why.
The width, in CSS pixels, at and above which the lesson Player wears its full chrome.