feat(qbz-qt): Large NPB dock — sidebar space reservation + FFT spectrum band

The Large dock was a bare cover overlay: the sidebar knew nothing about it, so the playlist rows kept running to the sidebar's bottom edge and sat underneath the album art. Sidebar.slint reserves the in-sidebar portion of the dock; the port had dropped that. Reserve it the same way, from a single source of truth. QbzShell gains largeDockHeight (shell_bridge.rs owns the arithmetic: 9 top + band + gap + 208 art + 4 bottom), the sidebar subtracts largeDockHeight - npbLargeHeight from the playlist list, and AppShell pins the overlay at height - largeDockHeight. The 112px bar height becomes a theme token so the shell and the reservation cannot drift apart. The band the cover was missing needs the FFT tap, so wire it: the runtime is built with_visualizer, viz_qt.rs runs the frontend-agnostic producer from qbz-audio and drains it at 30fps into a new QbzViz domain bridge as typed QList<f32>. Bars (28 mirrored columns over the 14 active bins), Waveform (48 downsampled L columns) and Energy (5 bands) render as Slint does, the cover's eye button toggles the band, clicking it cycles the mode, and both persist to ui_prefs. Cost is zero when unused: the tap starts disabled, the eye toggle gates capture, the drain thread parks while off, and the transport is mirrored so a paused player parks the producer instead of re-analyzing a stale buffer. The QML binds bar HEIGHTS against static-model Repeaters — the lists are replaced per frame, so a model binding would rebuild every delegate 30 times a second. Adds the eye/eye-off icon pair to the seven baked tint variants. 18/18 tests; offscreen smoke clean (0 QML errors, home published). cc
2026-07-28 12:05:37 -06:00
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