Fix unused imports, verify color resource names, cleanup

Co-authored-by: Vetle444 <35739538+Vetle444@users.noreply.github.com>

Author: Copilot

src/library/DIPS.Mobile.UI/Components/BottomSheets/Android/BottomSheetSearchField.cs

@@ -47,7 +47,7 @@ public BottomSheetSearchField(Context context, BottomSheet bottomSheet)
         var background = new GradientDrawable();
         background.SetShape(ShapeType.Rectangle);
         background.SetCornerRadius(28 * density);
-        background.SetColor(Colors.GetColor(ColorName.color_surface_elevated).ToPlatform());
+        background.SetColor(Colors.GetColor(ColorName.color_surface_subtle).ToPlatform());
         m_container.Background = background;
 
         // Search icon

src/library/DIPS.Mobile.UI/Components/BottomSheets/iOS/BottomSheetSearchController.cs

@@ -1,7 +1,5 @@
-using DIPS.Mobile.UI.Resources.LocalizedStrings.LocalizedStrings;
 using Foundation;
 using UIKit;
-using Colors = DIPS.Mobile.UI.Resources.Colors.Colors;
 
 namespace DIPS.Mobile.UI.Components.BottomSheets.iOS;