fix(review): 优化复习滚动条展示方式

- 去除"复习滚动条"模块标题，改用右侧小字颜色图例
- 按 session 维度分组展示，一次学习的报告和残片合并为一个条目
- 移除类型标签（报告/残片），改用左边框颜色区分（绿色=有报告，黄色=仅残片）
- 展示内容从 50 字增加到 120 字
- 滚动动画从 80s 放慢到 150s

src/components/Welcome.vue

@@ -6,31 +6,72 @@ import { getReviewFeed, type ReviewFeedItem } from "@/api/review";
 const reviewItems = ref<ReviewFeedItem[]>([]);
 const isHovering = ref(false);
 
-const truncatedItems = computed(() =>
-  reviewItems.value.map((item) => ({
-    ...item,
-    display:
-      item.content.length > 50
-        ? item.content.substring(0, 50) + "..."
-        : item.content,
-  }))
-);
+interface SessionGroup {
+  sessionNum: string;
+  taskName: string;
+  taskNum: string;
+  content: string;
+  hasReport: boolean;
+  fragmentCount: number;
+  navigateType: string;
+  navigateId: number;
+}
+
+// 按 sessionNum 分组，一个会话展示为一个 chip
+const sessionGroups = computed<SessionGroup[]>(() => {
+  const map = new Map<string, ReviewFeedItem[]>();
+  for (const item of reviewItems.value) {
+    const list = map.get(item.sessionNum) || [];
+    list.push(item);
+    map.set(item.sessionNum, list);
+  }
+
+  const groups: SessionGroup[] = [];
+  for (const [sessionNum, items] of map) {
+    const first = items[0];
+    const report = items.find(i => i.sourceType === "REPORT");
+    const fragments = items.filter(i => i.sourceType === "FRAGMENT");
+
+    const rawContent = report?.content || fragments.map(f => f.content).join("；");
+    const content = rawContent.length > 120
+      ? rawContent.substring(0, 120) + "..."
+      : rawContent;
+
+    groups.push({
+      sessionNum,
+      taskName: first.taskName,
+      taskNum: first.taskNum,
+      content,
+      hasReport: !!report,
+      fragmentCount: fragments.length,
+      navigateType: report ? "report" : "fragment",
+      navigateId: report ? report.id : (fragments[0]?.id ?? 0),
+    });
+  }
+
+  groups.sort((a, b) => {
+    const aItem = reviewItems.value.find(i => i.sessionNum === a.sessionNum);
+    const bItem = reviewItems.value.find(i => i.sessionNum === b.sessionNum);
+    return (bItem?.createdTime || "").localeCompare(aItem?.createdTime || "");
+  });
+
+  return groups;
+});
 
 // 复制一份实现无缝循环
-const duplicatedItems = computed(() => [...truncatedItems.value, ...truncatedItems.value]);
+const duplicatedGroups = computed(() => [...sessionGroups.value, ...sessionGroups.value]);
 
 const loadReviewFeed = async () => {
   try {
-    const res = await getReviewFeed(30);
+    const res = await getReviewFeed(100);
     reviewItems.value = res?.data || [];
   } catch {
     // feed 加载失败不影响页面主体功能
   }
 };
 
-const goToReviewDetail = (item: ReviewFeedItem) => {
-  const type = item.sourceType === "REPORT" ? "report" : "fragment";
-  router.push(`/review/detail/${type}/${item.id}`);
+const goToReviewDetail = (group: SessionGroup) => {
+  router.push(`/review/detail/${group.navigateType}/${group.navigateId}`);
 };
 
 const startStudy = () => {
@@ -48,8 +89,13 @@ onMounted(() => {
 
 <template>
   <section class="welcome-page">
-    <div class="review-scroll-section surface-card" v-if="reviewItems.length > 0">
-      <h3>复习滚动条</h3>
+    <div class="review-scroll-section surface-card" v-if="sessionGroups.length > 0">
+      <div class="review-scroll-header">
+        <span class="color-legend">
+          <span class="dot dot-report"></span> 有学习报告
+          <span class="dot dot-fragment"></span> 仅有学习残片
+        </span>
+      </div>
       <div class="review-scroll-track">
         <div
           class="review-scroll-content"
@@ -58,21 +104,14 @@ onMounted(() => {
           @mouseleave="isHovering = false"
         >
           <span
-            v-for="(item, index) in duplicatedItems"
+            v-for="(group, index) in duplicatedGroups"
             :key="index"
             class="review-chip"
-            @click="goToReviewDetail(item)"
+            :class="group.hasReport ? 'has-report' : 'fragments-only'"
+            @click="goToReviewDetail(group)"
           >
-            <el-tag
-              size="small"
-              :type="item.sourceType === 'REPORT' ? 'success' : 'warning'"
-              effect="plain"
-              disable-transitions
-            >
-              {{ item.sourceType === 'REPORT' ? '报告' : '残片' }}
-            </el-tag>
-            <strong>{{ item.taskName }}</strong>
-            <span>{{ item.display }}</span>
+            <strong class="chip-task">{{ group.taskName }}</strong>
+            <span class="chip-content">{{ group.content }}</span>
           </span>
         </div>
       </div>
@@ -158,14 +197,38 @@ onMounted(() => {
 
 /* 复习滚动条区域 */
 .review-scroll-section {
-  padding: 20px 22px;
+  padding: 14px 22px;
   overflow: hidden;
 }
 
-.review-scroll-section h3 {
-  margin: 0 0 12px;
-  color: var(--green-900);
-  font-size: 16px;
+.review-scroll-header {
+  display: flex;
+  justify-content: flex-end;
+  margin-bottom: 10px;
+}
+
+.color-legend {
+  font-size: 12px;
+  color: var(--text-secondary);
+  display: inline-flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.dot {
+  display: inline-block;
+  width: 8px;
+  height: 8px;
+  border-radius: 2px;
+  margin-right: 3px;
+}
+
+.dot-report {
+  background: var(--green-600);
+}
+
+.dot-fragment {
+  background: #e6a23c;
 }
 
 .review-scroll-track {
@@ -178,7 +241,7 @@ onMounted(() => {
   display: inline-flex;
   gap: 14px;
   white-space: nowrap;
-  animation: review-ticker 80s linear infinite;
+  animation: review-ticker 150s linear infinite;
 }
 
 .review-scroll-content.paused {
@@ -197,33 +260,50 @@ onMounted(() => {
 .review-chip {
   display: inline-flex;
   align-items: center;
-  gap: 8px;
-  padding: 8px 14px;
+  gap: 10px;
+  padding: 8px 16px;
   background: var(--surface-strong);
   border: 1px solid var(--border-soft);
-  border-radius: 24px;
+  border-left: 3px solid transparent;
+  border-radius: 6px;
   cursor: pointer;
   transition: background 0.2s, box-shadow 0.2s;
   flex-shrink: 0;
   user-select: none;
 }
 
+.review-chip.has-report {
+  border-left-color: var(--green-600);
+}
+
+.review-chip.fragments-only {
+  border-left-color: #e6a23c;
+}
+
 .review-chip:hover {
-  background: #e8f5e9;
   box-shadow: var(--shadow-soft);
 }
 
-.review-chip strong {
-  color: var(--green-700);
-  font-size: 13px;
+.review-chip.has-report:hover {
+  background: #e8f5e9;
 }
 
-.review-chip span {
+.review-chip.fragments-only:hover {
+  background: #fff8e1;
+}
+
+.chip-task {
+  color: var(--green-700);
+  font-size: 13px;
+  flex-shrink: 0;
+}
+
+.chip-content {
   color: var(--text-secondary);
   font-size: 13px;
   overflow: hidden;
   text-overflow: ellipsis;
-  max-width: 220px;
+  max-width: 320px;
 }
 
 .tips-board {