feat: 学习会话页展示当前会话碎片列表并支持编辑

- 会话加载时获取碎片列表，创建碎片后自动刷新
- 碎片列表支持内联编辑（textarea + 保存/取消）
- 修复多根节点问题，用 div 包裹模板内容以兼容 Transition 组件

src/components/StartTask.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, onMounted, onUnmounted, ref } from "vue";
+import { computed, onMounted, onUnmounted, ref, watch } from "vue";
 import { useRoute } from "vue-router";
 import { ElMessage, ElMessageBox } from "element-plus";
 import { useTimer } from "@/components/composables/useTimer";
@@ -10,6 +10,7 @@ import {
   startOrContinueStudySession,
 } from "@/api/studySessions";
 import { useStudyFragment } from "@/components/composables/fragment";
+import { getFragmentsBySession, updateFragments } from "@/api/reportFragments";
 import router from "@/router";
 
 const {
@@ -23,6 +24,16 @@ const {
 const summaryDialogVisible = ref(false);
 const summaryContent = ref("");
 
+// 当前会话碎片列表
+interface FragmentItem {
+  id: number;
+  content: string;
+}
+const fragmentsList = ref<FragmentItem[]>([]);
+const editingFragmentId = ref<number | null>(null);
+const editFragmentContent = ref("");
+const savingFragment = ref(false);
+
 const route = useRoute();
 const taskNum = route.params.taskNum as string;
 
@@ -213,6 +224,7 @@ const loadTaskSession = async () => {
     } else {
       syncDisplay(taskInfo.value.pointerPosition || 25 * 60 * 1000);
     }
+    loadFragments();
   } catch (err: any) {
     ElMessage.error(err.message || "加载任务失败");
   }
@@ -227,6 +239,53 @@ const initPage = async () => {
   await loadTaskSession();
 };
 
+// 碎片列表
+const loadFragments = async () => {
+  if (!taskInfo.value.sessionNum) return;
+  try {
+    const res = await getFragmentsBySession(taskInfo.value.sessionNum);
+    if (res?.code === 200) {
+      fragmentsList.value = res.data || [];
+    }
+  } catch {
+    // 非关键数据
+  }
+};
+
+const startEditFragment = (fragment: FragmentItem) => {
+  editingFragmentId.value = fragment.id;
+  editFragmentContent.value = fragment.content;
+};
+
+const cancelEditFragment = () => {
+  editingFragmentId.value = null;
+  editFragmentContent.value = "";
+};
+
+const saveEditFragment = async (id: number) => {
+  if (!editFragmentContent.value.trim()) {
+    ElMessage.warning("内容不能为空");
+    return;
+  }
+  savingFragment.value = true;
+  try {
+    const res = await updateFragments(id, editFragmentContent.value);
+    if (res?.code === 200) {
+      const item = fragmentsList.value.find((f) => f.id === id);
+      if (item) item.content = editFragmentContent.value;
+      editingFragmentId.value = null;
+      editFragmentContent.value = "";
+      ElMessage.success("保存成功");
+    } else {
+      ElMessage.error(res?.message || "保存失败");
+    }
+  } catch (e: any) {
+    ElMessage.error(e.message || "请求失败");
+  } finally {
+    savingFragment.value = false;
+  }
+};
+
 onMounted(() => {
   displayInterval = window.setInterval(() => {
     nowTimestamp.value = Date.now();
@@ -234,6 +293,13 @@ onMounted(() => {
   initPage();
 });
 
+// 碎片创建成功后刷新列表
+watch(fragmentsDialogVisible, (newVal, oldVal) => {
+  if (oldVal === true && newVal === false) {
+    loadFragments();
+  }
+});
+
 onUnmounted(() => {
   if (displayInterval) {
     clearInterval(displayInterval);
@@ -243,6 +309,7 @@ onUnmounted(() => {
 </script>
 
 <template>
+  <div>
   <section class="start-page">
     <div class="task-info-bar">
       <el-tag type="success" effect="plain">任务编号：{{ taskInfo.taskNum }}</el-tag>
@@ -298,6 +365,33 @@ onUnmounted(() => {
         </div>
       </article>
     </div>
+
+    <!-- 当前会话学习残片 -->
+    <article class="surface-card fragments-card" v-if="fragmentsList.length > 0">
+      <h3>当前会话学习残片</h3>
+      <div
+        v-for="fragment in fragmentsList"
+        :key="fragment.id"
+        class="fragment-item"
+      >
+        <template v-if="editingFragmentId === fragment.id">
+          <el-input
+            v-model="editFragmentContent"
+            type="textarea"
+            :rows="3"
+            placeholder="请输入学习内容"
+          />
+          <div class="fragment-edit-actions">
+            <el-button size="small" @click="cancelEditFragment">取消</el-button>
+            <el-button size="small" type="primary" :loading="savingFragment" @click="saveEditFragment(fragment.id)">保存</el-button>
+          </div>
+        </template>
+        <template v-else>
+          <span class="fragment-content">{{ fragment.content }}</span>
+          <el-button size="small" @click="startEditFragment(fragment)">编辑</el-button>
+        </template>
+      </div>
+    </article>
   </section>
 
   <el-dialog v-model="fragmentsDialogVisible" title="生成学习残片" width="520px">
@@ -325,6 +419,7 @@ onUnmounted(() => {
       <el-button type="success" @click="endTimer(summaryContent)">确认结束</el-button>
     </template>
   </el-dialog>
+  </div>
 </template>
 
 <style scoped>
@@ -425,6 +520,42 @@ onUnmounted(() => {
   margin: 0;
 }
 
+.fragments-card {
+  padding: 20px;
+}
+
+.fragments-card h3 {
+  margin: 0 0 14px;
+  color: var(--green-900);
+}
+
+.fragment-item {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  padding: 10px 0;
+  border-bottom: 1px solid var(--border-soft);
+}
+
+.fragment-item:last-child {
+  border-bottom: none;
+}
+
+.fragment-content {
+  flex: 1;
+  font-size: 14px;
+  line-height: 1.6;
+  color: var(--text-primary);
+  word-break: break-word;
+}
+
+.fragment-edit-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 8px;
+  margin-top: 8px;
+}
+
 @media (max-width: 1100px) {
   .session-grid {
     grid-template-columns: 1fr;