fix: Prevent React app flash by hiding static content with display: none

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

webclient/public/index.html

@@ -32,8 +32,8 @@
 
 		<script>document.documentElement.className = 'js-enabled';</script>
 		<style>
-			.js-enabled #root > * {
-				visibility: hidden;
+			.js-enabled .static-content {
+				display: none;
 			}
 			html {
 				overflow-y: scroll;
@@ -58,6 +58,7 @@
 			})();
 		</script>
 		<div id="root">
+			<div class="static-content">
 				<div class="container menu">
 					<p>
 						<a href="/">QotNews</a>
@@ -150,6 +151,7 @@
 					</div>
 				{% endif %}
 			</div>
+		</div>
 		<!--
 			This HTML file is a template.
 			If you open it directly in the browser, you will see an empty page.