重构组件，优化性能并移除不必要的属性；撤销滚动条修改；

src/components/chat/AgentTurn.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import Image from "next/image";
-import React from "react";
+import React, { useMemo } from "react";
 import ReactMarkdown from "react-markdown";
 import remarkGfm from "remark-gfm";
 import { AnimatePresence, motion } from "framer-motion";
@@ -85,15 +85,21 @@ export const AgentTurn = React.memo(
     const [editDraft, setEditDraft] = React.useState(message.content);
     const rootMessageId = message.branchRootId ?? message.id;
 
-    const parsedAssistantSections =
-      !isUser && !isErrorMessage
-        ? parseAssistantMessageSections(message.content)
-        : null;
+    const parsedAssistantSections = useMemo(
+      () =>
+        !isUser && !isErrorMessage
+          ? parseAssistantMessageSections(message.content)
+          : null,
+      [isErrorMessage, isUser, message.content],
+    );
     const answerContent = parsedAssistantSections?.answer ?? message.content;
-    const contentSegments: ContentSegment[] =
-      !isUser && !isErrorMessage
-        ? parseContentWithToolCalls(answerContent).segments
-        : [{ type: "text", content: answerContent }];
+    const contentSegments: ContentSegment[] = useMemo(
+      () =>
+        !isUser && !isErrorMessage
+          ? parseContentWithToolCalls(answerContent).segments
+          : [{ type: "text", content: answerContent }],
+      [answerContent, isErrorMessage, isUser],
+    );
     
     if (isUser) {
       return (