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/AgentProgressTimeline.tsx

@@ -85,7 +85,12 @@ const formatToolTitle = (item: ChatProgress) => {
   return item.title;
 };
 
-export const AgentProgressTimeline = ({ progress, isAborted }: { progress: ChatProgress[], isAborted?: boolean }) => {
+type AgentProgressTimelineProps = {
+  progress: ChatProgress[];
+  isAborted?: boolean;
+};
+
+const AgentProgressTimelineInner = ({ progress, isAborted }: AgentProgressTimelineProps) => {
   const theme = useTheme();
   const [nowMs, setNowMs] = useState(() => Date.now());
   
@@ -356,3 +361,12 @@ export const AgentProgressTimeline = ({ progress, isAborted }: { progress: ChatP
     </Box>
   );
 };
+
+export const AgentProgressTimeline = React.memo(
+  AgentProgressTimelineInner,
+  (prevProps, nextProps) =>
+    prevProps.progress === nextProps.progress &&
+    prevProps.isAborted === nextProps.isAborted,
+);
+
+AgentProgressTimeline.displayName = "AgentProgressTimeline";