refactor(12.A): rename Mix* visualizer engine to Waveform* abstraction

DeepDrftPublic.Client/Pages/MixDetail.razor

@@ -36,7 +36,7 @@ else
     @* Full-page waveform sits behind the scaffold content. The scaffold's container is positioned
        above it via the mix-detail-foreground stacking context. TrackId lets the visualizer couple to
        playback only when the player is on this mix's track. *@
-    <MixWaveformVisualizer ReleaseEntryKey="@release.EntryKey" TrackId="@ViewModel.Track?.Id" />
+    <WaveformVisualizer ReleaseEntryKey="@release.EntryKey" TrackId="@ViewModel.Track?.Id" />
 
     <div class="mix-detail-foreground">
       <MudContainer MaxWidth="MaxWidth.Large" Class="mix-detail-container">
@@ -57,9 +57,9 @@ else
                    Phase 10 §4: the control is ALWAYS rendered; the lava-lamp toggle feeds its Visible
                    parameter, and the control itself @if-gates the knobs while holding the container's
                    reserved height — so content below never pops on toggle. The band mutates the shared
-                   MixVisualizerControlState; the backdrop bridge pushes the dials. A knob drag does not
+                   WaveformVisualizerControlState; the backdrop bridge pushes the dials. A knob drag does not
                    toggle it — the lamp's click does. *@
-                <MixVisualizerControls Visible="@_controlsExpanded" />
+                <WaveformVisualizerControls Visible="@_controlsExpanded" />
             </TopContent>
             <TopRightAction>
                 @* Lava-lamp button top-right, across from the back link. Toggles the knob band below the
@@ -126,8 +126,8 @@ else
         }
     }
 
-    // Lava-lamp knob-band visibility. Pure presentation over MixVisualizerControlState — gates whether
-    // the seven-knob MixVisualizerControls is rendered into the TopContent band; toggling it touches no
+    // Lava-lamp knob-band visibility. Pure presentation over WaveformVisualizerControlState — gates whether
+    // the seven-knob WaveformVisualizerControls is rendered into the TopContent band; toggling it touches no
     // control value or bridge push. The lava-lamp button's filled/outline glyph is driven off this flag.
     private bool _controlsExpanded;