feat(ui): add tooltip to session progress column

Explain the progress calculation (completed/estimated sessions) when
hovering over the progress bar in the evaluation list.

frontend/web/src/pages/IntelligentEvals.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react'
 import { useNavigate } from 'react-router-dom'
 import {
-  Button, Drawer, Empty, Form, Input, InputNumber, Popconfirm, Progress, Select, Space, Spin, Table, Tabs, Tag, message,
+  Button, Drawer, Empty, Form, Input, InputNumber, Popconfirm, Progress, Select, Space, Spin, Table, Tabs, Tag, Tooltip, message,
 } from 'antd'
 import type { TabsProps } from 'antd'
 import type { ColumnsType } from 'antd/es/table'
@@ -165,7 +165,9 @@ export default function IntelligentEvalsPage() {
         const estimated = ev.plan?.estimated_sessions ?? ev.session_count
         const running = (ev.sessions ?? []).filter((s) => s.status === 'running').length
         const pct = estimated ? Math.round((ev.completed_sessions / estimated) * 100) : 0
+        const tooltipText = `已完成 ${ev.completed_sessions} 个会话 / 预估 ${estimated} 个会话${running > 0 ? `（${running} 个进行中）` : ''}`
         return (
+          <Tooltip title={tooltipText}>
             <Space size={6}>
               <Progress percent={pct} size="small" style={{ width: 90 }} />
               <span style={{ fontSize: 12, color: colors.textSecondary }}>
@@ -173,6 +175,7 @@ export default function IntelligentEvalsPage() {
                 {running > 0 && <span style={{ color: statusColors.running, marginLeft: 4 }}>({running} 进行中)</span>}
               </span>
             </Space>
+          </Tooltip>
         )
       },
     },