Lift the WaveformVisualizer + control popover out of the 120px NowPlayingCard box into NowPlaying as a full-panel background layer; migrate the hero-right wrapper and its scoped styles from Home into NowPlaying.
Replace the 20 synthetic bars with a contained WaveformVisualizer driven by the live player, pointed at the current track; add a Fill mode (CSS-only, defaults off) sizing the canvas to its container; place the lava-lamp icon to popover on the card.
Add optional Ambient slot to ReleaseDetailScaffold (full-bleed layer behind content; absent = no regression). Cut mounts it + popover; Session mounts the engine directly behind its hero; Mix swaps its inline knob-bar for the lava-lamp popover.
Replace the TrackId-only IsActivePlayer gate with a LivePlayerTrack source that follows the playing track when it is the host track or shares the host release; single-track Mix/Session unchanged at parity.
Build WaveformVisualizerControlPopover pairing the lava-lamp trigger with the eight-knob WaveformVisualizerControls panel; style to the NowPlaying Hero look from tokens. Panel chrome scoped to the popover mount via a PanelChrome flag; Mix's inline mount unchanged.
Add GET api/track/{trackEntryKey}/waveform/high-res (+ proxy), ITrackDataService.GetTrackWaveform; rewire visualizer to resolve the current track's EntryKey and re-fetch on track change. Retire the client mix-waveform read path.
Use Fixed + RelativeWidth=Adaptive with BottomLeft/TopLeft origins to
anchor the menu under the share button; drop the inline-block shrink-wrap
container hack. Keep AutoClose off so the embed panel survives clicks.
Smooth the loudness contour (~50 ms envelope at preprocessing + decode-time, plus
smootherstep render reconstruction); retune wax↔waveform collision to bouncy/sub-unity
(no explosion/stuck/jitter); split the bubbles knob into fluid-amount + fluid-viscosity
(cohesion via uniform-only smin/wobble); retune scroll/gravity/heat/width ranges; make
the colour rotation visible and boost OKLab chroma; the controls bar now holds its
layout and hides only its knobs via a Visible parameter.
Queue owns ordered tracks, current index, skip-fwd/back, and auto-advance via the player's TrackEnded hook; binds through Attach (no ctor growth, no service-locator). Player-bar skip controls; empty-queue play unchanged. Adds QueueService unit tests.
Compose ReleaseDetailScaffold via Header + BodyContent slots for the Cut
album view: left meta + Play/Share, right theme-bordered cover, TrackNumber-
ordered track list with per-row play. CutDetailBase carries the multi-track
prerender bridge.
daniel-c-harvey