feat(web): render agent reports as safe-subset Markdown

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/agent/agent-conversation.tsx

@@ -36,6 +36,7 @@ import { ApprovalCard, type ApprovalCardStatus } from "~/components/agentui/appr
 import { type CitationItem, CitationList } from "~/components/agentui/citations.tsx";
 import { CHEVRON_CLASS, Disclosure } from "~/components/agentui/disclosure.tsx";
 import { FileDiff } from "~/components/agentui/file-diff.tsx";
+import { Markdown } from "~/components/agentui/markdown.tsx";
 import {
   Message,
   MessageAvatar,
@@ -427,7 +428,8 @@ export function AgentConversation({
               announce={false}
               showActions={!active && idx === lastText}
             >
-              {it.text}
+              {/* 流式中按原文显示(半截 Markdown 会闪),结束后按安全子集渲染 */}
+              {streaming ? it.text : <Markdown text={it.text} />}
             </StreamingResponse>
           </AssistantRow>
         );
@@ -724,7 +726,7 @@ export function FinalReport({
           模型说的（未经核查）
         </p>
         <StreamingResponse status="complete" copyText={said || undefined} contentClassName="max-h-60 overflow-auto">
-          {said || "（没有文字汇报）"}
+          {said ? <Markdown text={said} /> : "（没有文字汇报）"}
         </StreamingResponse>
         <p className="mt-2 text-meta text-muted-foreground">仅供参考，不作为完成依据。</p>
       </div>