HoverVideo now: (1) exposes a focusable button that toggles/plays sound by
keyboard, touch and pointer — hover is an enhancement, not the only path;
(2) gates the source behind an IntersectionObserver so offscreen cards no longer
download/decode, releasing the buffer on exit; (3) still blocks autoplay under
reduced motion while allowing voluntary playback via the button. Routed all 30
Thirty-Days cards through it (hasAudio={false} for the 12 silent ones) so no raw
<video autoPlay> bypasses the motion guard. Flagged by Magi (P1 #4/#5/#6).
ukimsanov
0467bc8129
