fix: finish widget modernization audit

apps/nextjs/src/components/board/advanced-focus/advanced-focus.module.css

@@ -70,7 +70,7 @@
 .surfaceHostAdvanced {
   position: fixed;
   inset: 0;
-  z-index: calc(var(--mantine-z-index-modal) - 1);
+  z-index: var(--homarr-z-index-widget-focus);
   width: auto;
   height: auto;
   pointer-events: none;