feat(visualizer): Phase 15 control-deck rework

Centered tinted MudOverlay (NowPlayingCard chrome) replaces the anchored popover; eight dials become a deterministic three-row LAVA/WAVE layout; lava + waveform lamp toggles drive a genuine per-subsystem draw-skip; scroll/zoom becomes a slider; playful tooltips; green=interactive/light=static.

DeepDrftPublic.Client/Controls/WaveformVisualizer.razor.cs

@@ -265,9 +265,10 @@ public partial class WaveformVisualizer : ComponentBase, IAsyncDisposable
                 return;
             }
 
-            // Seed the module with the current state now that it exists. All seven control values
-            // come from the shared (session-persisted) state, so a mix opened mid-session seeds the
-            // module with the knob positions the listener left them at.
+            // Seed the module with the current state now that it exists. All control values (the eight
+            // dials + the two Phase 15 subsystem enables) come from the shared (session-persisted) state,
+            // so a mix opened mid-session seeds the module with the knob/toggle positions the listener
+            // left them at.
             await PushControlsAsync();
             await PushDatumAsync();
             await PushPlaybackAsync();
@@ -291,8 +292,9 @@ public partial class WaveformVisualizer : ComponentBase, IAsyncDisposable
     // ── Bridge pushes. Each is a no-op until the module handle exists. ───────────────────────────
 
     /// <summary>
-    /// Push the eight control values to the module from the shared state. Used to seed on first render
-    /// and to re-push when the controls bar signals a change. Each value is its own dedicated dial:
+    /// Push the control values to the module from the shared state — the eight continuous dials plus the
+    /// two Phase 15 subsystem enables. Used to seed on first render and to re-push when the controls
+    /// panel signals a change. Each value is its own dedicated dial / enable:
     /// <list type="bullet">
     ///   <item>scroll speed [0,1] is mapped onto the useful zoom band via
     ///         <see cref="WaveformZoomMapping.ScrollKnobToSeconds"/> and pushed through <c>setScrollSpeed</c>
@@ -302,7 +304,9 @@ public partial class WaveformVisualizer : ComponentBase, IAsyncDisposable
     ///   <item>fluid amount → <c>setFluidAmount</c> (blob count + volume); fluid viscosity →
     ///         <c>setFluidViscosity</c> (cohesion / sphere-restoration) — the Phase 10 split of the
     ///         former single density knob;</item>
-    ///   <item>waveform width → the ribbon-extent uniform.</item>
+    ///   <item>waveform width → the ribbon-extent uniform;</item>
+    ///   <item>lava / waveform enabled → <c>setLavaEnabled</c> / <c>setWaveformEnabled</c>, the genuine
+    ///         per-subsystem draw-skip (no physics / no blob upload, ribbon SDF skipped — §10.1).</item>
     /// </list>
     /// </summary>
     private async Task PushControlsAsync()
@@ -319,6 +323,11 @@ public partial class WaveformVisualizer : ComponentBase, IAsyncDisposable
         await _handle.InvokeVoidAsync("setFluidViscosity", ControlState.FluidViscosity);
         await _handle.InvokeVoidAsync("setCollisionStrength", ControlState.CollisionStrength);
         await _handle.InvokeVoidAsync("setWaveformWidth", ControlState.WaveformWidth);
+        // Phase 15 — the two subsystem enables. "Off" is a genuine draw-skip in the module (no physics,
+        // no blob upload / ribbon SDF skipped), not a dim. Pushed through the same Changed seam as the
+        // dials, so a toggle re-reads here exactly as a knob does.
+        await _handle.InvokeVoidAsync("setLavaEnabled", ControlState.LavaEnabled);
+        await _handle.InvokeVoidAsync("setWaveformEnabled", ControlState.WaveformEnabled);
     }
 
     /// <summary>