fix: global nav background blur not applied in Safari

src/client/theme-default/components/VPNav.vue

@@ -34,6 +34,7 @@ provide('close-screen', closeScreen)
 
   .VPNav.no-sidebar {
     backdrop-filter: saturate(50%) blur(8px);
+    -webkit-backdrop-filter: saturate(50%) blur(8px);
   }
 }
 </style>

src/client/theme-default/components/VPNavBar.vue

@@ -66,6 +66,7 @@ const { hasSidebar } = useSidebar()
 
   .VPNavBar.has-sidebar .content {
     backdrop-filter: saturate(50%) blur(8px);
+    -webkit-backdrop-filter: saturate(50%) blur(8px);
   }
 }