Bug 5: in browser fullscreen the video stayed small and centred instead
of filling the screen. Two causes:
1. The wrapper carries 80vw/80vh + transform:scale(1.25) for the windowed
HTPC look; in native FS that scaled layer never filled. Size the
wrapper to 100vw/100vh with NO transform while fs is on.
2. The real culprit: the <video> was `w-auto h-auto max-h-full max-w-full`,
which caps at the stream's intrinsic resolution (720p -> 1280x720) and
never scales UP. The windowed scale(1.25) hid this. Switch to
`w-full h-full object-contain` so it fills the wrapper by aspect.
Verified visually in real Chrome native fullscreen: video rect 1920x1024
(fills), was 1280x720 centred.
peter
f8826b846b