fix: avoid stray zero in consultation composer

src/pages/Chat/TeacherChatPanel.tsx

@@ -443,7 +443,7 @@ export function TeacherChatPanel({
       {topic?.unsaved && <div className="px-5 py-2 text-xs text-destructive">回复尚未保存，请复制或重试保存。<button className="ml-2 underline" onClick={() => void teacherApi.save(topicBase, topic.id).then(consume).catch(() => setError('保存失败，请先复制回复。'))}>重试保存</button></div>}
       {!topicEnabled && !error && !busy && <p className="px-5 pb-2 text-xs text-muted-foreground">{legacyFriend ? '这是旧版内置朋友的话题，仅供查看。请选择智能体新建话题。' : `${label}暂未开放，历史仍可查看。`}</p>}
       <form className="px-4 pb-4 pt-2" onSubmit={(e) => { e.preventDefault(); void send(); }}>
-        {(legacyDraft.text?.trim() || legacyDraft.references?.length) && <details className="mb-2 text-xs text-muted-foreground">
+        {Boolean(legacyDraft.text?.trim() || legacyDraft.references?.length) && <details className="mb-2 text-xs text-muted-foreground">
           <summary>查看旧版朋友草稿</summary>
           <div className="max-h-40 overflow-auto whitespace-pre-wrap rounded-lg border p-2">
             {legacyDraft.text}