Move NowPlaying waveform visualizer to full-bleed hero-right background

Lift the WaveformVisualizer + control popover out of the 120px NowPlayingCard box into NowPlaying as a full-panel background layer; migrate the hero-right wrapper and its scoped styles from Home into NowPlaying.

DeepDrftPublic.Client/Controls/NowPlayingCard.razor.css

@@ -45,26 +45,3 @@
     color: rgba(250, 250, 248, 0.45);
     letter-spacing: 0.08em;
 }
-
-/* Contained visualizer region (Phase 12 mode C). The visualizer mounts with Fill="true", whose
-   layer is `position: absolute; inset: 0` — so this box must be a positioned, sized ancestor for the
-   canvas to fill. `overflow: hidden` keeps the lava inside the card's rounded chrome. The height is the
-   card's bounded live readout — taller than the old synthetic-bar strip so the real waveform reads, but
-   still compact for a home-page hero panel. */
-.np-visualizer {
-    position: relative;
-    height: 120px;
-    margin-top: 1.2rem;
-    overflow: hidden;
-    border-radius: 2px;
-}
-
-/* The lava-lamp popover trigger overlays the visualizer's top-right corner (full parity, §8e). Above
-   the canvas (z-index) and pointer-enabled so the icon is clickable even though the canvas layer below
-   it is pointer-events:none. */
-.np-visualizer-controls {
-    position: absolute;
-    top: 0.25rem;
-    right: 0.25rem;
-    z-index: 1;
-}