Cleanup some Client atmos systems (#33634)

* Cleanup `ScrubberControl.xaml.cs`

* Minor cleanups

* Another pile of minor cleanups

* Apply requested changes

* Rename "which" into "bound". Add whitespace after "if"

Content.Client/Atmos/Components/PipeColorVisualsComponent.cs

@@ -1,8 +1,4 @@
-using Robust.Shared.GameObjects;
-
 namespace Content.Client.Atmos.Components;
 
 [RegisterComponent]
-public sealed partial class PipeColorVisualsComponent : Component
-{
-}
+public sealed partial class PipeColorVisualsComponent : Component;