feat(复习): 节点选择交互 + 移除 session 维度

- MindMapViewer 新增 selectable 模式，点击节点 emit node-select 事件
- ReviewRecall.vue 移除会话选择器，改为节点选择交互
- 支持 URL ?focusPath= 参数自动预设复习起点
- 节点选择弹窗确认后回忆导图根节点=选中节点标题
- ReviewDetail 和 Welcome 中调用 findNode API 匹配节点后跳转
- API: recallCompare 使用 focusPath 替代 sessionNum
- API: 新增 findNode 端点

src/components/MindMapViewer.vue

@@ -25,6 +25,10 @@ const props = defineProps<{
   colorByCompare?: boolean;
   /** 画布高度，如 "520px"、"60vh"，默认 480px */
   height?: string;
+  /** 节点可选择模式（点击节点触发 node-select 事件） */
+  selectable?: boolean;
+  /** 当前选中的节点路径（用于高亮，仅在 selectable 模式下生效） */
+  selectedPath?: string;
 }>();
 
 const emit = defineEmits<{
@@ -32,11 +36,27 @@ const emit = defineEmits<{
   (e: "change", outline: string): void;
   /** 点击带溯源信息的节点 */
   (e: "node-click", node: { sourceType: string; sourceId: number }): void;
+  /** 选择模式下点击节点，返回标题+路径 */
+  (e: "node-select", node: { title: string; path: string; childCount: number }): void;
 }>();
 
 const container = ref<HTMLElement | null>(null);
 let instance: MindElixirInstance | null = null;
 let nodeCounter = 0;
+/** 节点路径映射：elixir node id → { title, path, childCount } */
+let nodePathMap: Record<string, { title: string; path: string; childCount: number }> = {};
+
+/** 递归构建节点路径映射 */
+const buildPathMap = (node: MindMapTreeNode, ancestors: string[]): { title: string; path: string; childCount: number } => {
+  const title = node.title || "(未命名)";
+  const path = [...ancestors, title].join(" / ");
+  const childCount = (node.children || []).reduce((sum, c) => sum + 1 + countAllDescendants(c), 0);
+  return { title, path, childCount };
+};
+
+const countAllDescendants = (node: MindMapTreeNode): number => {
+  return (node.children || []).reduce((sum, c) => sum + 1 + countAllDescendants(c), 0);
+};
 
 const COLOR_MATCHED = { background: "#c8e6c9", color: "#1b5e20" };
 const COLOR_MISSED = { background: "#ffcdd2", color: "#b71c1c" };
@@ -48,15 +68,20 @@ const compareStatus = (notes?: string): "MATCHED" | "MISSED" | null => {
   return null;
 };
 
-const toElixirNode = (node: MindMapTreeNode): any => {
+const toElixirNode = (node: MindMapTreeNode, ancestors: string[] = []): any => {
   nodeCounter += 1;
+  const elixirId = `n${nodeCounter}`;
   const result: any = {
-    id: `n${nodeCounter}`,
+    id: elixirId,
     topic: node.title || "(未命名)",
-    children: (node.children || []).map(toElixirNode),
+    children: (node.children || []).map((c) => toElixirNode(c, [...ancestors, node.title || "(未命名)"])),
   };
+  // 记录路径映射
+  if (props.selectable) {
+    nodePathMap[elixirId] = buildPathMap(node, ancestors);
+  }
   if (node.sourceType && node.sourceId != null) {
-    result.hyperLink = ""; // 占位，溯源通过 dangerouslySetInnerHTML 外的 tags 展示
+    result.hyperLink = "";
     result.tags = [node.sourceType === "REPORT" ? "报告" : node.sourceType === "FRAGMENT" ? "残片" : "应用"];
     result.sourceType = node.sourceType;
     result.sourceId = node.sourceId;
@@ -104,6 +129,7 @@ const render = () => {
     instance.destroy();
     instance = null;
   }
+  nodePathMap = {};
   instance = new MindElixir({
     el: container.value,
     direction: MindElixir.SIDE,
@@ -122,6 +148,13 @@ const render = () => {
   }
 
   instance.bus.addListener("selectNewNode", (node: any) => {
+    if (props.selectable && node?.id) {
+      const info = nodePathMap[node.id];
+      if (info) {
+        emit("node-select", info);
+        return;
+      }
+    }
     if (node?.sourceType && node?.sourceId != null) {
       emit("node-click", { sourceType: String(node.sourceType), sourceId: Number(node.sourceId) });
     }