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/ReviewRecall.vue

@@ -7,12 +7,12 @@ import {
   recallCompare,
   updateStandardMindMap,
   listRecallRecords,
+  findNode,
   type StandardMindMap,
   type RecallRecord,
 } from "@/api/standardMindMap";
 import { ElMessage, ElMessageBox } from "element-plus";
 import MindMapViewer, { type MindMapTreeNode } from "@/components/MindMapViewer.vue";
-import { getTaskSessions } from "@/api/studySessions";
 
 const route = useRoute();
 const router = useRouter();
@@ -30,10 +30,10 @@ let regeneratingTimer: ReturnType<typeof setInterval> | null = null;
 const lastResult = ref<any>(null);
 const hasCompared = ref(false);
 
-// 复习维度选择
-const sessions = ref<{ sessionNum: string; startTime: string; expectation: string; reportCount: number; fragmentCount: number }[]>([]);
-const selectedSession = ref("");
-const loadingSessions = ref(false);
+// 起点节点选择
+const focusPath = ref((route.query.focusPath as string) || "");
+const focusConfirmVisible = ref(false);
+const selectedNodeInfo = ref<{ title: string; path: string; childCount: number } | null>(null);
 
 // 回忆输入（思维导图形式）
 const recallTree = ref<MindMapTreeNode | null>(null);
@@ -192,7 +192,7 @@ const handleRecallCompare = async () => {
   comparingSeconds.value = 0;
   comparingTimer = setInterval(() => { comparingSeconds.value++; }, 1000);
   try {
-    const res = await recallCompare(taskNum.value, outline, selectedSession.value || undefined);
+    const res = await recallCompare(taskNum.value, outline, focusPath.value || undefined);
     standard.value = res?.data || null;
     hasCompared.value = true;
     // 解析对比结果
@@ -318,29 +318,26 @@ const extraNodes = computed(() => {
   return raw.map((item: any) => typeof item === "string" ? { title: item } : item);
 });
 
-// 加载会话列表（复习维度选择器用）
-const loadSessions = async () => {
-  loadingSessions.value = true;
-  try {
-    const res = await getTaskSessions(taskNum.value);
-    sessions.value = res?.data || [];
-  } catch {
-    sessions.value = [];
-  } finally {
-    loadingSessions.value = false;
-  }
+// 节点选择回调（selectable 模式下点击节点）
+const handleNodeSelect = (node: { title: string; path: string; childCount: number }) => {
+  selectedNodeInfo.value = node;
+  focusConfirmVisible.value = true;
 };
 
-// 格式化会话标签
-const formatSessionLabel = (s: { sessionNum: string; startTime: string; expectation: string; reportCount: number; fragmentCount: number }) => {
-  const date = s.startTime ? s.startTime.replace("T", " ").substring(0, 16) : s.sessionNum;
-  const hint = s.expectation ? s.expectation.substring(0, 30) : "";
-  return `${date} ${hint ? "— " + hint : ""}`;
+// 确认以选中节点为起点
+const confirmFocus = () => {
+  if (selectedNodeInfo.value) {
+    focusPath.value = selectedNodeInfo.value.path;
+    recallTree.value = {
+      title: selectedNodeInfo.value.title,
+      children: [],
+    };
+  }
+  focusConfirmVisible.value = false;
 };
 
 onMounted(() => {
   loadData();
-  loadSessions();
 });
 </script>
 
@@ -355,24 +352,25 @@ onMounted(() => {
       </el-button>
     </div>
 
-    <!-- 复习维度选择器 -->
-    <div class="review-scope surface-card" v-if="sessions.length > 0 || loadingSessions">
-      <span class="scope-label">复习范围</span>
-      <el-select v-model="selectedSession" placeholder="选择复习范围" clearable size="small" :loading="loadingSessions">
-        <el-option label="全部任务" value="" />
-        <el-option
-          v-for="s in sessions"
-          :key="s.sessionNum"
-          :label="formatSessionLabel(s)"
-          :value="s.sessionNum"
-        />
-      </el-select>
-      <el-tag v-if="selectedSession" size="small" type="success" effect="light">
-        已过滤：仅匹配该会话知识点
-      </el-tag>
-      <span v-else-if="!selectedSession" class="scope-hint">不过滤，对比全部标准导图</span>
+    <!-- 起点节点指示 -->
+    <div class="review-scope surface-card" v-if="focusPath">
+      <span class="scope-label">复习起点</span>
+      <el-tag size="small" type="success" effect="light">{{ focusPath }}</el-tag>
+      <el-button size="small" text @click="focusPath = ''">重选节点</el-button>
     </div>
 
+    <!-- 节点选择确认弹窗 -->
+    <el-dialog v-model="focusConfirmVisible" title="确认复习起点" width="400px">
+      <p v-if="selectedNodeInfo">
+        以 「<strong>{{ selectedNodeInfo.title }}</strong>」 为起点，
+        复习该知识点下的 <strong>{{ selectedNodeInfo.childCount }}</strong> 个子知识点？
+      </p>
+      <template #footer>
+        <el-button @click="focusConfirmVisible = false">取消</el-button>
+        <el-button type="success" @click="confirmFocus">确定</el-button>
+      </template>
+    </el-dialog>
+
     <!-- 统计卡片 -->
     <div class="stats-card surface-card" v-if="hasCompared && lastResult">
       <div class="stat-item">
@@ -404,7 +402,7 @@ onMounted(() => {
           @click="selectHistoryRecord(record)"
         >
           <span class="history-time">{{ record.createdTime?.replace("T", " ")?.substring(0, 16) }}</span>
-          <el-tag v-if="record.sessionNum" size="small" type="success" effect="plain" class="session-badge">会话</el-tag>
+          <el-tag v-if="record.focusPath" size="small" type="success" effect="plain" class="session-badge" :title="record.focusPath">节点</el-tag>
           <el-tag v-else size="small" type="info" effect="plain" class="session-badge">全部</el-tag>
           <span class="history-ratio">覆盖率 {{ (record.recallRatio * 100).toFixed(1) }}%</span>
           <span class="history-detail">✅{{ record.matchedCount }} ❌{{ record.missedCount }} ➕{{ record.extraCount }}</span>
@@ -493,11 +491,16 @@ onMounted(() => {
           <span>来源：{{ standard.generator }}</span>
           <span>参考：{{ standard.sourceReportCount }} 份报告 + {{ standard.sourceFragmentCount }} 份残片</span>
         </div>
+        <p v-if="!hasCompared && !focusPath" class="select-hint">
+          点击导图节点选择复习起点，选好后开始回忆填空
+        </p>
         <MindMapViewer
           v-if="standardTree"
           :tree="compareTree || standardTree"
           :color-by-compare="!!compareTree"
+          :selectable="!editingStandard && !focusPath && !hasCompared"
           height="60vh"
+          @node-select="handleNodeSelect"
           @node-click="goToNodeSource"
         />
         <pre v-else class="standard-outline">{{ standard.outline || standard.content }}</pre>
@@ -816,4 +819,14 @@ onMounted(() => {
 .session-badge {
   flex-shrink: 0;
 }
+
+.select-hint {
+  font-size: 13px;
+  color: #e6a23c;
+  margin: 0 0 8px;
+  padding: 6px 12px;
+  background: #fdf6ec;
+  border-radius: 4px;
+  border-left: 3px solid #e6a23c;
+}
 </style>