fix: reset z-index instead of inherited unset (#1528)

Co-authored-by: Aaron Pham <contact@aarnphm.xyz>

quartz/components/scripts/graph.inline.ts

@@ -580,7 +580,7 @@ document.addEventListener("nav", async (e: CustomEventMap["nav"]) => {
   function hideGlobalGraph() {
     container?.classList.remove("active")
     if (sidebar) {
-      sidebar.style.zIndex = "unset"
+      sidebar.style.zIndex = ""
     }
   }
 

quartz/components/scripts/search.inline.ts

@@ -178,7 +178,7 @@ document.addEventListener("nav", async (e: CustomEventMap["nav"]) => {
       searchBar.value = "" // clear the input when we dismiss the search
     }
     if (sidebar) {
-      sidebar.style.zIndex = "unset"
+      sidebar.style.zIndex = ""
     }
     if (results) {
       removeAllChildren(results)