feat: UserTimelinePage with Timeline component (ADMIN-INFO-009)

- UserTimelinePage: userId input → API query → Ant Design Timeline
- Supports array timeline + fallback JSON view for unknown formats
- Loading / empty / error states
- Route: /learning/timeline

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/pages/learning/DataPages.tsx

@@ -1,5 +1,7 @@
 import { useState } from 'react';
-import { Table, Input, Select, Space, Tag, Button, Tabs, Drawer, Descriptions, DatePicker } from 'antd';
+import { Table, Input, Select, Space, Tag, Button, Tabs, Drawer, Descriptions, DatePicker, Timeline, Typography } from 'antd';
+
+const { Text } = Typography;
 import { useQuery } from '@tanstack/react-query';
 import { learningAdminAPI } from '../../services/learningAdmin';
 import dayjs from 'dayjs';
@@ -410,6 +412,47 @@ export function AnomalyPage() {
   );
 }
 
+// ── User Timeline ──
+
+export function UserTimelinePage() {
+  const [userId, setUserId] = useState('');
+  const { data, isFetching, refetch } = useQuery({
+    queryKey: ['admin-user-timeline', userId],
+    queryFn: () => learningAdminAPI.getUserTimeline(userId),
+    enabled: false,
+  });
+
+  const items = Array.isArray(data)
+    ? (data as any[]).map((entry: any, i: number) => ({
+        key: i,
+        color: entry.recordType === 'session' ? 'blue' : entry.recordType === 'reading' ? 'green' : 'gray',
+        children: (
+          <div>
+            <Text type="secondary" style={{ fontSize: 12 }}>{entry.occurredAt ? dayjs(entry.occurredAt).format('YYYY-MM-DD HH:mm:ss') : '-'}</Text>
+            <div><Tag style={{ marginTop: 4 }}>{entry.recordType}</Tag></div>
+            <Text strong>{entry.title || '-'}</Text>
+            {entry.durationSeconds != null && <div><Text type="secondary">时长 {entry.durationSeconds}s</Text></div>}
+            {entry.materialId && <div><Text type="secondary">资料 {entry.materialId}</Text></div>}
+          </div>
+        ),
+      }))
+    : [];
+
+  return (
+    <PageWrapper title="用户学习时间线">
+      <Space style={{ marginBottom: 16 }}>
+        <Input placeholder="User ID" value={userId} onChange={e => setUserId(e.target.value)} style={{ width: 300 }} />
+        <Button type="primary" onClick={() => refetch()} loading={isFetching}>查询</Button>
+      </Space>
+      {data === undefined && !isFetching && <Text type="secondary">输入用户 ID 后点击查询</Text>}
+      {isFetching && <Text type="secondary">加载中...</Text>}
+      {data && !Array.isArray(data) ? <pre style={{ background: '#f5f5f5', padding: 16, borderRadius: 8, overflow: 'auto', maxHeight: 600 }}>{JSON.stringify(data as any, null, 2)}</pre> : null}
+      {Array.isArray(data) && data.length === 0 && !isFetching && <Text type="secondary">该用户暂无学习记录</Text>}
+      {items.length > 0 && <Timeline items={items} />}
+    </PageWrapper>
+  );
+}
+
 // ── User Diagnose ──
 
 export function UserDiagnosePage() {

src/routes/index.tsx

@@ -13,6 +13,7 @@ const ProgressPage = lazy(() => import('@/pages/learning/DataPages').then(m => (
 const DailyActivityPage = lazy(() => import('@/pages/learning/DataPages').then(m => ({ default: m.DailyActivityPage })))
 const RecordPage = lazy(() => import('@/pages/learning/DataPages').then(m => ({ default: m.RecordPage })))
 const AnomalyPage = lazy(() => import('@/pages/learning/DataPages').then(m => ({ default: m.AnomalyPage })))
+const UserTimelinePage = lazy(() => import('@/pages/learning/DataPages').then(m => ({ default: m.UserTimelinePage })))
 const UserDiagnosePage = lazy(() => import('@/pages/learning/DataPages').then(m => ({ default: m.UserDiagnosePage })))
 const MaterialDiagnosePage = lazy(() => import('@/pages/learning/DataPages').then(m => ({ default: m.MaterialDiagnosePage })))
 
@@ -44,6 +45,7 @@ export const routeConfig: RouteConfig[] = [
   { path: '/learning/progress', title: '阅读进度', element: ProgressPage },
   { path: '/learning/daily', title: '每日活动', element: DailyActivityPage },
   { path: '/learning/records', title: '学习记录', element: RecordPage },
+  { path: '/learning/timeline', title: '用户时间线', element: UserTimelinePage },
   { path: '/learning/anomalies', title: '异常数据', element: AnomalyPage },
   { path: '/learning/user-diagnose', title: '用户诊断', element: UserDiagnosePage },
   { path: '/learning/material-diagnose', title: '资料诊断', element: MaterialDiagnosePage },