feat(visualizer): controls row + unified MixVisualizerControlState; 3 inert uniforms wired (P10 W2)

DeepDrftPublic.Client/Controls/MixWaveformVisualizer.razor.css

@@ -19,27 +19,3 @@
     height: 100%;
     display: block;
 }
-
-/* Zoom slider — a small viewing control pinned to the top-right, clear of the player bar at
-   the bottom and the nav bar at the top. It is never a seek surface. top: 5rem sits just below the
-   fixed nav bar (~4.5rem tall) so neither the expanded player bar nor the nav occludes it.
-
-   position: fixed (not absolute) because the slider is now a top-level sibling of the backdrop, not
-   a child of it — see the comment in the .razor. z-index: 10 lifts it above the page foreground
-   (.mix-detail-foreground, z-index: 1) so the foreground can't intercept its pointer events; that
-   occlusion was the resolution-slider regression. */
-.mix-waveform-zoom {
-    position: fixed;
-    right: 1.5rem;
-    top: 5rem;
-    z-index: 10;
-    width: 180px;
-    max-width: 40vw;
-    pointer-events: auto;
-    opacity: 0.7;
-    transition: opacity 0.2s ease;
-}
-
-.mix-waveform-zoom:hover {
-    opacity: 1;
-}