feat: 回忆导图根节点自动聚焦指定路径

- loadData 中根据 focusPath 自动查找标准导图节点设为根
- 新增 findNodeByPath 辅助函数支持路径定位
- 有 focusPath 时节点始终可点选

src/components/ReviewRecall.vue

@@ -121,9 +121,30 @@ const loadData = async () => {
     if (!recallTree.value) {
       recallTree.value = buildEmptyRecallTree();
     }
+    // 若从 URL 带了 focusPath，自动设置回忆导图根节点
+    if (focusPath.value && standard.value?.content) {
+      try {
+        const tree = JSON.parse(standard.value.content) as MindMapTreeNode;
+        const match = findNodeByPath(tree, focusPath.value);
+        if (match) {
+          recallTree.value = { title: match.title, children: [] };
+        }
+      } catch { /* ignore */ }
+    }
   }
 };
 
+const findNodeByPath = (node: MindMapTreeNode, path: string): MindMapTreeNode | null => {
+  const parts = path.split(" / ");
+  let current: MindMapTreeNode | null = node;
+  for (let i = 0; i < parts.length && current; i++) {
+    if (current.title === parts[i] && i === parts.length - 1) return current;
+    const child = (current.children || []).find((c) => c.title === parts[i]);
+    current = child || null;
+  }
+  return null;
+};
+
 // 重新生成（防抖 + 用户编辑时弹窗选模式）
 const handleRegenerate = async () => {
   // 防抖：正在生成中跳过
@@ -521,7 +542,7 @@ onMounted(() => {
           v-if="standardTree"
           :tree="compareTree || standardTree"
           :color-by-compare="!!compareTree"
-          :selectable="!editingStandard && !focusPath && !hasCompared"
+          :selectable="!editingStandard && !hasCompared"
           height="60vh"
           @node-select="handleNodeSelect"
           @node-click="goToNodeSource"