Left panel toggles cover/synced lyrics (reuses LyricsLinesView, gated on status==2 to dodge the geometry recursion footgun); right panel is a Queue/History list (Flickable+VerticalLayout so rows top-anchor). The lyrics-sync engine bailed unless a desktop/immersive surface was open, so a kiosk-lyrics-follow flag on ShellState widens lyrics_surface_open().
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