fix: display name for file nodes

quartz/components/ExplorerNode.tsx

@@ -160,7 +160,7 @@ export function ExplorerNode({ node, opts, fullPath, fileData }: ExplorerNodePro
         // Single file node
         <li key={node.file.slug}>
           <a href={resolveRelative(fileData.slug!, node.file.slug!)} data-for={node.file.slug}>
-            {node.file.frontmatter?.title}
+            {node.name}
           </a>
         </li>
       ) : (