Replace the 3D ring jukebox with a flat curtain browser: selected season
faces the screen as top of the left stack, side cards rotate about their
outer edge and recede into the screen, each side evenly spaced with pitch
adapting to its card count so cards never leave the stage.
- Mount episode videos only after the season switch settles, then
preload=auto + autoplay (avoids mid-animation media setup jank)
- Start videos immediately (no stagger) once an episode is pointed at;
keep staggered starts while navigating the season selector
- Keyboard/gamepad entry into the season row lands on the selected
season via data-nav-entry-col instead of the x-closest card
- Black episode tiles; hidden (ahead-of-cursor) tiles get a sheen and
vignette veil that cross-fades on reveal/conceal
- Nudge season info panel 8px left for balanced gaps