Add z-index for Spotlight Tooltip in Popover

- Introduced a new CSS rule to set the z-index for popovers containing spotlight tooltips, ensuring proper layering in the user interface.
- This change enhances the visibility and interaction of tooltips within the application, improving overall user experience.

assets/stylesheets/App.css

@@ -349,6 +349,10 @@ code {
   padding: 0 !important;
 }
 
+.ant-popover:has(.spotlight-tooltip) {
+  z-index: 1051;
+}
+
 :root,
 .light-mode,
 html:has(.light-mode) {