fix: keep v2 modal above header

apps/nextjs/src/components/layout/v2-beta-announcement/v2-beta-announcement.tsx

@@ -8,6 +8,7 @@ import {
   Anchor,
   Box,
   Button,
+  getDefaultZIndex,
   Group,
   Paper,
   SimpleGrid,
@@ -289,6 +290,7 @@ const V2BetaAnnouncementModal = createModal<V2BetaAnnouncementModalProps>(({ inn
   defaultTitle: "Homarr v2 beta",
   size: 1000,
   centered: true,
+  zIndex: getDefaultZIndex("modal") + 2,
 });
 
 interface V2BetaInstallInstructionsProps {