Major Menu Band rolling-staff redesign: - StaffView is a piano-roll timeline with chromatic pills, accent-color semitone guides, ledger fading, beat-marker drop animation - Metronome trapezoid + chip needle synced via sin-keyframed CAAnimation - Yellow flash on beat; tighter timer tolerance; click + drop tinted yellow → orange → red → settle - Player-piano MIDI drop: drop a .mid/.midi onto the menubar icon to auto-play through the synth (events route through startTapNote so the staff + icon light up) - forceLayout demoted from hard-pin to ceiling; adapt polling 6s→2s, expand-verify 0.25s→0.6s - Popover NSVisualEffectView pinned-appearance fix so glass tint flips on system theme switch - Cherry-pick: Esteban's left-right palette instrument switching