fix(theme): green hero Share/Play/Queue glyphs in dark via shared .dd-accent-icon

Fold Session/Mix hero glyphs into the reusable accent-icon treatment so they reach
the glyph (beating .mud-secondary-text) green-accent in both themes; drop the dead
wrapper white rule and the redundant dark-only hero override. Light pixel-identical.

DeepDrftPublic.Client/Controls/ReleaseHeroOverlay.razor

@@ -52,7 +52,7 @@
         </MudStack>
         @if (ShareContent is not null)
         {
-            <div class="release-hero-share">
+            <div class="release-hero-share dd-accent-icon">
                 @ShareContent
             </div>
         }
@@ -74,7 +74,7 @@
             </div>
             @if (PlayContent is not null)
             {
-                <div class="release-hero-play">
+                <div class="release-hero-play dd-accent-icon">
                     @PlayContent
                 </div>
             }

DeepDrftPublic.Client/Controls/ReleaseHeroOverlay.razor.css

@@ -151,14 +151,10 @@
     flex: 0 0 auto;
 }
 
-/* The play affordance and share button sit over a dark image — force their icon glyphs to the
-   light theme color regardless of MudBlazor's Secondary palette. Both PlayStateIcon and
-   SharePopover render MudIconButton / MudProgressCircular internals, so ::deep is required. */
-::deep .release-hero-play .mud-icon-button,
-::deep .release-hero-play .mud-progress-circular,
-::deep .release-hero-share .mud-icon-button {
-    color: var(--deepdrft-white);
-}
+/* The play/share glyphs are coloured by the shared .dd-accent-icon treatment (green-accent in
+   both themes) applied on .release-hero-play / .release-hero-share in ReleaseHeroOverlay.razor —
+   see deepdrft-styles.css. No co-located colour rule here: a wrapper-level override could not
+   reach the .mud-secondary-text !important glyph anyway. */
 
 @media (max-width: 599.98px) {
     .release-hero {

DeepDrftPublic.Client/Controls/WaveformVisualizerControlPopover.razor

@@ -29,7 +29,7 @@
    the shared WaveformVisualizerControlState and raises Changed; the visualizer bridge subscribes. This
    host only toggles open/closed and centers the panel — it stays purely presentational. *@
 
-<div class="dd-lava-lamp-trigger">
+<div class="dd-accent-icon">
     <MudTooltip Text="Visualizer settings">
         <MudIconButton Icon="@(_open ? DDIcons.LavaLampFilled : DDIcons.LavaLamp)"
                        Size="@IconSize"