Fix stale spacer-observe comment: drop visualizer/clipping ref, name spacer as sole consumer

DeepDrftPublic.Client/Controls/AudioPlayerBar/AudioPlayerBar.razor.cs

@@ -246,13 +246,15 @@ public partial class AudioPlayerBar : ComponentBase, IAsyncDisposable
         }
 
         // For the docked player: we observe in BOTH expanded and minimized states
-        // so --player-height always reflects the live height of whichever element
-        // is visible. This keeps the WaveformVisualizer clipped to the top of
-        // the footer in both states (fix §1).
+        // so --player-height stays non-zero and always reflects the live height of
+        // whichever element is visible. The var's sole live consumer is the
+        // player-spacer's .expanded height (keeps the spacer sized correctly across
+        // breakpoints and banner reflows).
         //   expanded  → observe _playerRoot (full player bar, reflows across breakpoints)
         //   minimized → observe _miniDock   (floating FAB container, ~56–60px)
-        // The player-spacer's .minimized class uses a hardcoded height and ignores
-        // the var, so publishing the FAB height here does not regress the spacer.
+        // The player-spacer's .minimized class uses a hardcoded 60px and ignores
+        // the var, so observing in minimized state is belt-and-braces; it does not
+        // regress the spacer.
 
         var elementToObserve = _isMinimized ? _miniDock : _playerRoot;
         var alreadyOnThisElement = _spacerObserved && elementToObserve.Id == _lastObservedElement.Id;