fix：优化流式输出渲染与列表 key 稳定性

- 流式阶段改为纯文本展示，结束后一次性渲染 Markdown，减少重渲染与闪烁
- 为消息生成本地 groupId，避免 key 依赖内容导致不稳定
- MarkdownDetail 支持禁用 mermaid，并在图表内容为空时避免闪烁

Made-with: Cursor

src/components/MarkdownDetail/index.tsx

-import { type ReactNode, isValidElement, memo, useEffect, useId, useMemo, useState } from 'react'
+import { type ReactNode, isValidElement, memo, useEffect, useId, useMemo, useRef, useState } from 'react'
 import ReactMarkdown from 'react-markdown'
 import rehypeRaw from 'rehype-raw'
 import rehypeSanitize, { defaultSchema } from 'rehype-sanitize'
@@ -8,6 +8,8 @@ import { Image } from '@heroui/react'
 
 interface MarkdownDetailProps {
   children: ReactNode
+  /** Disable mermaid/pie rendering (fallback to normal code block). */
+  disableMermaid?: boolean
 }
 
 const sanitizeSchema = {
@@ -63,13 +65,18 @@ function MermaidBlock({ chart }: { chart: string }) {
   const renderId = useMemo(() => `mermaid-${reactId.replace(/:/g, '-')}`, [reactId])
   const [svg, setSvg] = useState<string>('')
   const [hidden, setHidden] = useState<boolean>(false)
+  const svgContainerRef = useRef<HTMLDivElement | null>(null)
 
   useEffect(() => {
     let cancelled = false
     const code = normalizeMermaid(chart)
     if (!code) {
-      setSvg('')
-      setHidden(true)
+      // During streaming, chart text may be temporarily empty.
+      // Keep the previous SVG (if any) to avoid flicker, and only hide when nothing to show.
+      if (!svg) {
+        setSvg('')
+        setHidden(true)
+      }
       return () => {
         cancelled = true
       }
@@ -116,17 +123,24 @@ function MermaidBlock({ chart }: { chart: string }) {
     }
   }, [chart, renderId])
 
+  useEffect(() => {
+    const el = svgContainerRef.current
+    if (!el)
+      return
+    el.innerHTML = svg
+  }, [svg])
+
   if (hidden || !svg)
     return null
 
   return (
     <div className="my-[8px] overflow-x-auto">
-      <div dangerouslySetInnerHTML={{ __html: svg }} />
+      <div ref={svgContainerRef} />
     </div>
   )
 }
 
-export const MarkdownDetail: React.FC<MarkdownDetailProps> = memo(({ children }) => {
+export const MarkdownDetail: React.FC<MarkdownDetailProps> = memo(({ children, disableMermaid }) => {
   return (
     <ReactMarkdown
       rehypePlugins={[rehypeRaw, [rehypeSanitize, sanitizeSchema as any]]}
@@ -154,7 +168,7 @@ export const MarkdownDetail: React.FC<MarkdownDetailProps> = memo(({ children })
           if (isValidElement(first)) {
             const className = String((first.props as any)?.className || '')
             const lang = className.match(/language-(\S+)/)?.[1]?.toLowerCase()
-            if (lang?.startsWith('mermaid') || lang === 'pie') {
+            if (!disableMermaid && (lang?.startsWith('mermaid') || lang === 'pie')) {
               const chart = toText((first.props as any)?.children)
               return <MermaidBlock chart={chart} />
             }

src/pages/Chat/Chat.tsx

@@ -22,6 +22,16 @@ import ScrollBtoIcon from '@/assets/svg/scrollBto.svg?react'
 import { setIsAsking } from '@/store/chatSlice'
 import SdreamLoading from '@/components/SdreamLoading'
 
+function makeLocalGroupId(prefix: string) {
+  try {
+    // modern browsers
+    return `${prefix}-${crypto.randomUUID()}`
+  }
+  catch {
+    return `${prefix}-${Date.now()}-${Math.random().toString(16).slice(2)}`
+  }
+}
+
 export const Chat: React.FC = () => {
   const { id } = useParams<{ id: string }>()
   const location = useLocation()
@@ -200,6 +210,7 @@ export const Chat: React.FC = () => {
       if (isEmptyQuestion && (lastIndex < 0 || newItems[lastIndex].role !== 'ai' || shouldAlwaysAppendAi)) {
         newItems.push({
           role: 'ai',
+          groupId: makeLocalGroupId('ai'),
           answerList: [{ answer: '' }],
         } as ChatRecord)
       }
@@ -253,6 +264,7 @@ export const Chat: React.FC = () => {
       if (isEmptyQuestion && (lastIndex < 0 || newItems[lastIndex].role !== 'ai')) {
         newItems.push({
           role: 'ai',
+          groupId: makeLocalGroupId('ai'),
           answerList: [{ answer: '' }],
         } as ChatRecord)
       }
@@ -316,10 +328,12 @@ export const Chat: React.FC = () => {
         ...prevItems,
         {
           role: 'user',
+          groupId: makeLocalGroupId('user'),
           question,
         } as ChatRecord,
         {
           role: 'ai',
+          groupId: makeLocalGroupId('ai'),
           answerList: [{ answer: '' }],
         } as ChatRecord,
       ])
@@ -1032,7 +1046,7 @@ export const Chat: React.FC = () => {
                   const recordId = record.answerList?.[0]?.recordId || record.groupId
                   const uniqueKey = recordId
                     ? `${record.role}-${recordId}`
-                    : `${record.role}-${record.question || record.answerList?.[0]?.answer || ''}-${index}`
+                    : `${record.role}-${index}`
 
                   // 如果历史记录中 firstQaFlag 为 true，隐藏 UI 但保留组件渲染（确保自动提交逻辑能执行）
                   const shouldHideHistoryItem = record.role === 'ai' && record.answerList?.[0]?.firstQaFlag === true
@@ -1048,7 +1062,6 @@ export const Chat: React.FC = () => {
                     && hasQuestion
                     && (hasAnswer || hasCardList)
                     && firstAnswer?.firstQaFlag !== true
-console.log('9yyyyyyyyyy', record.answerList?.[0]?.answer, uniqueKey)
                   return (
                   <div
                     className="w-full chatItem mx-auto"

src/pages/Chat/components/ChatItem/ChatAnswerParser.tsx

-import React, { useEffect, useState } from 'react'
+import React, { useEffect, useRef, useState } from 'react'
 import { Chip } from '@heroui/react'
 import { ChatAnswerAttachment } from './ChatAnswerAttchment'
 import { ChatAnswerOperate } from './ChatAnswerOperate'
@@ -43,11 +43,10 @@ function CheckIcon({ ...props }) {
 export const ChatAnswerParser: React.FC<ChatAnswerParserProps> = ({ isLastAnswer, onTyping, onComplate, answer, isStopTyping, onSubmitQuestion, hideOperate, onWorkflowSubmit, isWorkflowSubmitting, isAsking = false }) => {
   const formatAnswer = formatMarkdown(answer.answer || '')
   const [displayedText, setDisplayedText] = useState('')
-  const [currentIndex, setCurrentIndex] = useState(0)
   const [isTyping, setIsTyping] = useState(false)
   const [hideOperateByCard, setHideOperateByCard] = useState(false)
-  const [isImageAnswer, setIsImageAnswer] = useState(false)
   const [hasProcessedCardList, setHasProcessedCardList] = useState(false) // 添加标记，避免重复处理cardList
+  const completedOnceRef = useRef(false)
 
   function extractImageSources(htmlString: string): string[] {
     const imgRegex = /<img[^>]+src="([^">]+)"/gi
@@ -119,44 +118,34 @@ export const ChatAnswerParser: React.FC<ChatAnswerParserProps> = ({ isLastAnswer
   }
 
   useEffect(() => {
-    if (isStopTyping) {
+    // Streaming stage: render plain text only (no markdown parsing / no typewriter),
+    // to avoid heavy re-rendering and page flicker.
+    if (!answer.endAnswerFlag) {
+      setDisplayedText(answer.answer || '')
+      setIsTyping(false)
+      completedOnceRef.current = false
       return
     }
-    if (!isTyping) {
-      onTyping()
-      setIsTyping(true)
-    }
-    if (currentIndex < formatAnswer.length) {
-      const nextChar = formatAnswer[currentIndex]
-      if (nextChar === '<' || isImageAnswer) {
-        setIsImageAnswer(true)
-        const timer = setTimeout(() => {
-          setCurrentIndex(prevIndex => prevIndex + 1)
-        }, 10) // 调整此值以改变打字速度
-        return () => clearTimeout(timer)
-      }
-      else {
-        const timer = setTimeout(() => {
-          setDisplayedText(formatAnswer.slice(0, currentIndex + 1))
-          setCurrentIndex(prevIndex => prevIndex + 1)
-        }, 10) // 调整此值以改变打字速度
-        return () => clearTimeout(timer)
-      }
+    // Stream ended: render full markdown once (no typewriter) to avoid heavy re-renders.
+    if (completedOnceRef.current)
+      return
+    completedOnceRef.current = true
+
+    // Keep existing contract: notify typing start/end callbacks once.
+    onTyping()
+    setIsTyping(false)
+
+    if (formatAnswer.includes('<img')) {
+      handleImageAnswer()
     }
     else {
-      if (answer.endAnswerFlag) {
-        if (isImageAnswer) {
-          handleImageAnswer()
-        }
-        else {
-          setIsTyping(false)
-          onComplate()
-        }
-         // 流式输出结束时检查 cardList 中的 URL
-         handleCardListUrls()
-      }
+      setDisplayedText(formatAnswer)
+      onComplate()
     }
-  }, [answer, currentIndex])
+
+    // 流式输出结束时检查 cardList 中的 URL
+    handleCardListUrls()
+  }, [answer.endAnswerFlag, answer.answer])
 
   const handleStopTyping = async () => {
     const res = await fetchTerminateQuestion(answer)
@@ -197,9 +186,17 @@ export const ChatAnswerParser: React.FC<ChatAnswerParserProps> = ({ isLastAnswer
 
       {!!displayedText.length && (
         <div style={{ background: '#F7FAFD' }} className={answer.cardList?.length ? 'mb-[20px]' : ''}>
-          <MarkdownDetail>
-            {displayedText}
-          </MarkdownDetail>
+          {answer.endAnswerFlag
+            ? (
+                <MarkdownDetail>
+                  {displayedText}
+                </MarkdownDetail>
+              )
+            : (
+                <pre className="whitespace-pre-wrap break-words">
+                  {displayedText}
+                </pre>
+              )}
         </div>
       )}
       {!isTyping