DirectProject 聊天投影补 memo，让下游 memo 不再空转

- DirectProjectChatView 的 directTurns 改用 useMemo 缓存，判据为 directEntries / localMessages / directTurnRunning / pendingUserItemId
- 注释写明不缓存时每次渲染都是新数组引用，useDirectProjectTurnStatus 里以 turns 为判据的 useMemo 永远命中不了，读者会误以为 turnStatus 引用稳定

apps/ai-game-creator-shell/src/view/project-development/chat/DirectProjectChatView.tsx

@@ -1,6 +1,12 @@
 import type { UIEventHandler } from 'react';
 import type { Ref } from 'react';
-import { useEffect, useImperativeHandle, useRef, useState } from 'react';
+import {
+  useEffect,
+  useImperativeHandle,
+  useMemo,
+  useRef,
+  useState,
+} from 'react';
 
 import { AGENT_CHAT_SCROLL_BOTTOM_THRESHOLD } from '../../../app/constants';
 import { claimInitialTurnForPage } from '../../../app/initialTurnClaims';
@@ -133,12 +139,19 @@ export function DirectProjectChatView({
     turnCancelling,
     uploadFiles,
   } = chat;
-  const directTurns = buildDirectChatTurns({
-    entries: directEntries,
-    localMessages,
-    turnRunning: directTurnRunning,
-    pendingUserItemId,
-  });
+  // 这份投影要参与下游 memo 的判据，必须自己先缓存：不缓存的话每次渲染都是一份新数组，
+  // `useDirectProjectTurnStatus` 里以 `turns` 为判据的 `useMemo` 永远命中不了，那层 memo
+  // 就成了死代码，读代码的人还会误以为 `turnStatus` 是引用稳定的。
+  const directTurns = useMemo(
+    () =>
+      buildDirectChatTurns({
+        entries: directEntries,
+        localMessages,
+        turnRunning: directTurnRunning,
+        pendingUserItemId,
+      }),
+    [directEntries, localMessages, directTurnRunning, pendingUserItemId],
+  );
   // 「这一轮在跑吗」只从这一个派生入口读：原生真相 / 本地命令在飞 / 最新一轮三态。
   const turnStatus = useDirectProjectTurnStatus({
     turnRunning: directTurnRunning,