[docs] refactor: Improve sidebar item handling in handleMenuClick

In the handleMenuClick function, the logic has been updated to handle different types of sidebar items more effectively. The function now distinguishes between dropdown items, header links, and regular sidebar items. Dropdown items and header links with href="#" are prevented from closing the sidebar. Additionally, header links that are not part of the sidebar now scroll to the top instead of collapsing the sidebar.

docs/docsify-sidebar-collapse.js

@@ -89,6 +89,15 @@
         var newActiveNode = findTagParent(e.target, "LI", 2);
         if (!newActiveNode) return;
 
+        // Check if the clicked item is a dropdown item
+        var isDropdownItem = !e.target.href || e.target.href === "#";
+        var isHeader = e.target.tagName === "A";
+
+        if (isDropdownItem || (isHeader && e.target.getAttribute("href") === "#")) {
+            // Prevent closing the sidebar for dropdown items
+            e.stopPropagation();
+        }
+
         if (newActiveNode.classList.contains("open")) {
             newActiveNode.classList.remove("open"); // docsify 默认行为会操作 collapse，我们异步之后修补