feat(chat): add manual refresh for delivered agents

src/pages/Chat/TeacherCompanion.tsx

@@ -1,4 +1,4 @@
-import { ArrowUpRight, Loader2, X } from 'lucide-react';
+import { ArrowUpRight, Loader2, RefreshCw, X } from 'lucide-react';
 import { useState, type Ref } from 'react';
 import { Provider as TooltipProvider } from '@radix-ui/react-tooltip';
 import { TeacherAvatar } from './TeacherAvatar';
@@ -28,6 +28,9 @@ export function TeacherCompanion({ companion, open, onOpen, onToggle, bubbleRef,
   const status = loading ? '正在连接智能体…'
     : checking ? '智能体在看看你最近的进展…'
     : error || (!enabled ? '智能体暂未开放，仍可查看以往讨论' : open ? '我们慢慢聊，想到什么都可以说' : '点我聊聊，想到什么都可以说');
+  const refreshMessage = companion.refreshing ? '正在刷新…'
+    : companion.refreshStatus === 'error' ? '刷新失败，请重试'
+    : companion.refreshStatus === 'success' ? '已更新' : '';
   return (
     <TooltipProvider delayDuration={180} skipDelayDuration={100}>
     <section className="teacher-companion no-drag" aria-label="智能体陪伴" data-testid="teacher-companion">
@@ -50,6 +53,13 @@ export function TeacherCompanion({ companion, open, onOpen, onToggle, bubbleRef,
         {checking && <Loader2 className="h-3 w-3 shrink-0 animate-spin text-muted-foreground motion-reduce:animate-none" aria-label="智能体正在思考" />}
       </button></TeacherIntroduction>}
       </nav>
+      <button type="button" className="consultation-agents-refresh" aria-label="刷新智能体"
+        title={refreshMessage || '刷新智能体'} disabled={loading || companion.refreshing} aria-busy={companion.refreshing}
+        onMouseDown={(event) => event.preventDefault()} onClick={() => { setIntroductionId(null); void companion.refresh(); }}>
+        <RefreshCw className={`h-3.5 w-3.5 shrink-0 ${companion.refreshing ? 'animate-spin motion-reduce:animate-none' : ''}`} aria-hidden="true" />
+        <span>{companion.refreshing ? '刷新中' : companion.refreshStatus === 'error' ? '刷新失败' : companion.refreshStatus === 'success' ? '已更新' : '刷新'}</span>
+      </button>
+      <span className="sr-only" role="status" aria-live="polite">{refreshMessage}</span>
       {(invitation || welcome) && <div ref={bubbleRef} className="teacher-companion-presence" data-testid="teacher-presence">
         <div className="teacher-companion-bubble" data-testid="teacher-invitation" data-bubble-kind={invitation ? 'check-in' : 'welcome'}>
           <div className="teacher-companion-bubble-heading">