refactor: SimulatorMask use CSS classes

Replace inline style.display with CSS class toggling.

Changes:
- Add .visible class to CSS module
- Use classList.add/remove instead of style.display

packages/page-controller/src/mask/SimulatorMask.module.css

@@ -7,3 +7,7 @@
 
 	display: none;
 }
+
+.wrapper.visible {
+	display: block;
+}