Adds CoerceTheaterMode() to WaveformVisualizerControlState; ToggleLava/ToggleWaveform
call it before NotifyChanged so all observers see consistent state in one Changed cycle.
Covers the dead-end escape route bug (Phase 20 review finding).
Mute --deepdrft-panel-ground; WAVE scroll MudSlider back to RadialKnob; new DDIcons Waveform/WaveformFilled glyph for the waveform toggle; strong green ON-state chip vs dim OFF; refresh popover pointer-capture comment.
Tokenize scrim navy RGB triple (--deepdrft-scrim-rgb); LAVA row now
flex-start so knobs group left; WAVE row keeps space-between for
right-pinned width knob; remove inert margin-left:auto/wvc-row-right;
correct stale seven->ten count in OnControlStateChanged comment.
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.
daniel-c-harvey