Fixing status message z-index

Adding z-index css attribute to status message.

Bug: T403013
Change-Id: Ic1b73d3cf07c803a335c6e455c46e54757f0a80c

Author: mahmoud-abdelsattar-wmde

repo/resources/wikibase.wbui2025/wikibase.wbui2025.statusMessage.vue

@@ -75,6 +75,7 @@ module.exports = exports = defineComponent( {
 .wikibase-wbui2025-status-message-container {
 	position: fixed;
 	bottom: 0;
+	z-index: 1;
 
 	& .cdx-message--user-dismissable {
 		padding: 10px 10px 28px;