Warm the lrclib cache the moment a track starts (Android PlayerController
onMediaItemTransition; web onNpSongChange) so opening the Lyrics tab is
instant. Extract a DOM-free fetch helper on web for reuse.
Rewrite Android lyrics autoscroll to center on the active line's measured
position in a LazyColumn instead of a fixed line-height estimate — removes
stutter and the downward drift on wrapped lines; active line sits at a
~40%-from-top reading anchor.
CHANGELOG: fold into 1.0; drop the now-fixed lyrics known-issue note.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>