feat(file-tree): use anchor tags for better navigation

Convert div elements to anchor tags in FileTree and HeadingNode to
enable native browser features like middle-click to open in new tabs.
The implementation preserves SPA navigation for left-clicks while
ensuring search parameters are preserved in the href.

src/components/FileTree.tsx

@@ -1,4 +1,5 @@
 import { Component, createMemo, createSignal, Show } from "solid-js";
+import { useLocation } from "@solidjs/router";
 import { type FileNode, type TocNode } from "../data-loader";
 import { useNavigateWithParams } from "./useNavigateWithParams";
 import { useScrollContainer } from "../App";
@@ -24,6 +25,7 @@ export const FileTreeNode: Component<{
   isHidden?: (node: FileNode) => boolean;
 }> = (props) => {
   const navigate = useNavigateWithParams();
+  const location = useLocation();
   const isDir = !!props.node.children;
   const isActive = createMemo(() => props.currentPath === props.node.path);
   // 默认收起，除非当前文件在该文件夹内
@@ -31,21 +33,28 @@ export const FileTreeNode: Component<{
     isDir && isPathInDir(props.currentPath, props.node.path),
   );
 
-  const handleClick = () => {
+  const href = () => props.node.path + location.search;
+
+  const handleClick = (e: MouseEvent) => {
     if (isDir) {
+      e.preventDefault();
       setIsExpanded(!isExpanded());
-    } else {
+    } else if (e.button === 0) {
+      // Left-click: use SPA navigation
+      e.preventDefault();
       navigate(props.node.path);
       props.onClose();
     }
+    // Middle-click / right-click: let the browser handle the <a> natively
   };
 
   const indent = props.depth * 12;
 
   return (
     <div class={props.isHidden?.(props.node) === true ? "hidden" : ""}>
-      <div
+      <a
-        class={`flex items-center py-1 px-2 cursor-pointer hover:bg-gray-100 rounded ${
+        href={href()}
+        class={`flex items-center py-1 px-2 cursor-pointer hover:bg-gray-100 rounded no-underline ${
           isActive() ? "bg-blue-50 text-blue-700" : "text-gray-700"
         }`}
         style={{ "padding-left": `${indent + 8}px` }}
@@ -58,7 +67,7 @@ export const FileTreeNode: Component<{
           <span class="mr-1 text-gray-400">📄</span>
         </Show>
         <span class="text-sm truncate">{props.node.name}</span>
-      </div>
+      </a>
       <Show when={isDir && isExpanded() && props.node.children}>
         <div>
           {props.node.children!.map((child) => (
@@ -87,8 +96,9 @@ export const HeadingNode: Component<{
   isHidden?: (node: TocNode) => boolean;
 }> = (props) => {
   const navigate = useNavigateWithParams();
+  const location = useLocation();
   const anchor = props.node.id || "";
-  const href = `${props.basePath}#${anchor}`;
+  const href = () => `${props.basePath}${location.search}#${anchor}`;
   const hasChildren = !!props.node.children;
   // 默认收起，除非当前锚点在该节点内
   const [isExpanded, setIsExpanded] = createSignal(props.depth <= 0);
@@ -102,8 +112,12 @@ export const HeadingNode: Component<{
   const scrollContainer = useScrollContainer();
 
   const handleClick = (e: MouseEvent) => {
+    if (e.button === 0) {
+      // Left-click: use SPA navigation
       e.preventDefault();
-    navigate(href);
+      navigate(href());
+    }
+    // Middle-click / right-click: let the browser handle the <a> natively
     // 滚动到目标元素，考虑导航栏高度偏移
     requestAnimationFrame(() => {
       const element = document.getElementById(anchor);
@@ -141,7 +155,7 @@ export const HeadingNode: Component<{
           </span>
         </span>
         <a
-          href={href}
+          href={href()}
           class="inline-flex items-center py-0.5 px-2 text-sm text-gray-600 hover:text-gray-900 hover:bg-gray-50 rounded truncate cursor-pointer"
           onClick={handleClick}
         >