refactor(editor): Color palette updates, introduce dark mode (#6980)

Github issue / Community forum post (link here to close automatically):

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Co-authored-by: Mutasem <mutdmour@gmail.com>

packages/editor-ui/src/composables/useLoadingService.ts

@@ -20,7 +20,7 @@ export function useLoadingService() {
 			lock: true,
 			text: text || i18n.baseText('genericHelpers.loading'),
 			spinner: 'el-icon-loading',
-			background: 'rgba(255, 255, 255, 0.8)',
+			background: 'var(--color-dialog-overlay-background)',
 		}) as unknown as LoadingService;
 	}