Sidebar header gains the controls flyout (auto-follow, font size on the
280px-adapted scale, dimming, active color, uppercase, copy lyrics,
reset). Every setting persists per user via the new lyrics_prefs store
(loaded on all session activation paths, applied into LyricsState,
Tauri defaults). Settings gains the lyrics cache row with honest per-user
stats and clear (the F1 fix shipped in qbz-lyrics). Parity and @tr sweep
over the sidebar surfaces per the review inventory.
Closes the S1-S5 implementation run of the Lyrics epic: Qobuz-first
word-synced lyrics (real per-word timestamps - richer than Tauri's
line-level estimation), LRCLIB/lyrics.ovh fallback, shared per-user cache
with additive wsync column, 30Hz sync engine with word-anchored karaoke
fill, auto-center scroll, and QConnect peer-following.
cc