fix: tablet/auto full-player overrides now win (cascade order) + cover
My tablet media query was BEFORE the base sheet rules (.audio-sheet-cover/
info/controls at ~446+), so the base overrode the tablet overrides -> cover
stayed 320px, buttons small. Block moved to AFTER the base rules. Cover now
scales with 48vh, play 108px, panel full-width. audio.css v=2->v=3.
(Verified live via Chrome at 768-1199px: panel full-width, cover ~437px at
tablet height, large buttons.)
Co-Authored-By: Claude <noreply@…>