feat(public): scrolling Canvas 2D Mix visualizer — windowed, playback-coupled, zoomable, read-only (8.K W2)

DeepDrftPublic.Client/Pages/MixDetail.razor

@@ -35,8 +35,9 @@ else
     var hasDate = release.ReleaseDate is not null;
 
     @* Full-page waveform sits behind the scaffold content. The scaffold's container is positioned
-       above it via the mix-detail-foreground stacking context. *@
-    <MixWaveformVisualizer ReleaseId="@release.Id" />
+       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 ReleaseId="@release.Id" TrackId="@ViewModel.Track?.Id" />
 
     <div class="mix-detail-foreground">
         <ReleaseDetailScaffold Title="@release.Title"