This isn't used anywhere

src/domain/session/settings/SettingsViewModel.js

@@ -187,9 +187,5 @@ export class SettingsViewModel extends ViewModel {
         // emit so that radio-buttons become displayed/hidden
         this.emitChange("themeOption");
     }
-
-    get preferredColorScheme() {
-        return this.platform.themeLoader.preferredColorScheme;
-    } 
 }