overlay.js

<script>
	window.toggleOverlayPanel = function() {{
		var panel = document.getElementById('scxmPanel');
		if (!panel) return;
		var isOpen = panel.classList.toggle('open');
		
		try {{
			panel.setAttribute('aria-hidden', !isOpen);
			localStorage.setItem('scxmPanelOpen', isOpen ? '1' : '0');
		}} catch(e) {{
			console.log(e);
		}}
	}};

	(function(){{
		var btn = document.getElementById('openPanel');

		if (btn) {{
			btn.addEventListener('click', function() {{
				window.toggleOverlayPanel();
			}});
		}}
		
		try {{
			var prev = localStorage.getItem('scxmPanelOpen');
			if (prev === '1') {{
				var panel = document.getElementById('scxmPanel');
				if (panel) panel.classList.add('open');
			}}
		}} catch(e) {{
			console.log(e);
		}}
	}})();
</script>