perf(chat): skip stable node list mapping

packages/client/ui-chat/src/client/chat/ChatView.tsx

@@ -1,7 +1,7 @@
 // An enclosing `[data-conversation-scroll]` owns scrolling when present;
 // otherwise this view owns it. Each row subscribes to one stable node key.
 
-import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react'
+import { memo, useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState, type ComponentProps } from 'react'
 import type {
   ConversationTimelineSnapshot, RenderMessageImages,
 } from '@deepseek-ai/dsh-client-ui-conversation/client'
@@ -199,6 +199,16 @@ function TurnStatus({ startTime, t }: {
   )
 }
 
+type ChatNodeListProps = Omit<ComponentProps<typeof ChatNodeSeat>, 'nodeKey'> & {
+  readonly order: readonly string[]
+}
+
+const ChatNodeList = memo(function ChatNodeList({ order, ...seatProps }: ChatNodeListProps) {
+  return order.map(nodeKey => (
+    <ChatNodeSeat key={nodeKey} nodeKey={nodeKey} {...seatProps} />
+  ))
+})
+
 /**
  * The chat view slot entry: pure component over the composed props; each
  * ordered business Node crosses the keyed renderer seat.
@@ -743,10 +753,8 @@ export function ChatView({
               </button>
             </div>
           )}
-          {order.map(nodeKey => (
-            <ChatNodeSeat
-              key={nodeKey}
-              nodeKey={nodeKey}
+          <ChatNodeList
+            order={order}
             useChatNode={useChatNode}
             useChatNodeProcess={useChatNodeProcess}
             historyIncomplete={hasMore}
@@ -763,7 +771,6 @@ export function ChatView({
             renderSlot={renderSlot}
             t={t}
           />
-          ))}
           {/* No pending placeholders: questions (ui-user-questions) and approvals
               (ApprovalPanel) both take over the composer, so a flow card would
               double-render the same wait. */}