Better layout: when the drawer opens in fullscreen, shrink the player's inner
.ytp container to calc(100% - drawer width) so the video sits in the remaining
left area and the drawer owns the right — no overlap, both fully visible side
by side. Because controls, the coach caption and the Highlights button all live
inside .ytp, they move with the video automatically, so the previous overlay
compensations (control/gradient shift, caption re-anchor, button reposition)
are dropped. Drawer is now a clean solid panel (var(--bg-secondary)) since the
video is no longer behind it; blurred-glass background + @supports fallback
removed. Animated via a width transition on .ytp.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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