抽出策划视图共用的 Design 模式判据与回调兜底

- apps/ai-game-creator-shell/src/view/project-development/planning/PlanningChatView.tsx 新增 designMode、designActionsBusy 与三个 Design 回调兜底常量
- DesignAgentPhaseStatus（顶部）与 DesignAgentPendingActions（底部）原先各自重复 designView||onDesignApprove、controlBusy||planGddDecisionBusy 和 ?? (()=>undefined)，现在共用同一份取值

apps/ai-game-creator-shell/src/view/project-development/planning/PlanningChatView.tsx

@@ -206,6 +206,12 @@ export function PlanningChatView({
     needsUserInput ||
     Boolean(designView?.session.pendingApproval) ||
     Boolean(designView?.session.pendingClarification);
+  // 顶部状态条与底部待办区渲染的是同一份 Design Agent 状态，判据与回调兜底必须同源。
+  const designMode = Boolean(designView || onDesignApprove);
+  const designActionsBusy = controlBusy || planGddDecisionBusy;
+  const handleDesignApprove = onDesignApprove ?? (() => undefined);
+  const handleDesignClarify = onDesignClarify ?? (() => undefined);
+  const handleDesignRetry = onDesignRetry ?? (() => undefined);
 
   const renderMessage = (message: ChatMessage, index: number) => (
     <div
@@ -239,14 +245,14 @@ export function PlanningChatView({
   return (
     <section className="project-chat-surface" aria-label="立项策划对话">
       <div className="project-chat-conversation">
-        {designView || onDesignApprove ? (
+        {designMode ? (
           <DesignAgentPhaseStatus
             view={designView}
-            busy={controlBusy || planGddDecisionBusy}
+            busy={designActionsBusy}
             error={planGddError}
-            onApprove={onDesignApprove ?? (() => undefined)}
-            onClarify={onDesignClarify ?? (() => undefined)}
-            onRetry={onDesignRetry ?? (() => undefined)}
+            onApprove={handleDesignApprove}
+            onClarify={handleDesignClarify}
+            onRetry={handleDesignRetry}
           />
         ) : (
           <PlanGddSurface
@@ -378,14 +384,14 @@ export function PlanningChatView({
             </button>
           </div>
         ) : null}
-        {designView || onDesignApprove ? (
+        {designMode ? (
           <DesignAgentPendingActions
             view={designView}
-            busy={controlBusy || planGddDecisionBusy}
+            busy={designActionsBusy}
             error={planGddError}
-            onApprove={onDesignApprove ?? (() => undefined)}
-            onClarify={onDesignClarify ?? (() => undefined)}
-            onRetry={onDesignRetry ?? (() => undefined)}
+            onApprove={handleDesignApprove}
+            onClarify={handleDesignClarify}
+            onRetry={handleDesignRetry}
           />
         ) : null}
         <form className="project-chat-composer" onSubmit={onSubmit}>