修复策划模式输入提示显示

策划模式保留输入框但隐藏占位文案

补充策划模式输入框显示回归测试

apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx

@@ -491,7 +491,9 @@ export function ProjectSupervisorView({
             placeholder={
               directCodex
                 ? '告诉陶泥儿接下来要做什么，或输入 @ 选择资源'
-                : '告诉项目总控接下来要做什么，或输入 @ 选择资源'
+                : planningSurfaceActive
+                  ? ''
+                  : '告诉项目总控接下来要做什么，或输入 @ 选择资源'
             }
             onChange={onChatInputChange}
           />

apps/ai-game-creator-shell/tests/appSurface/plan-gdd.suite.ts

@@ -577,6 +577,21 @@ export function registerPlanGddApprovalTests() {
     expect(screen.queryByText(/计划 \d+\/\d+/)).toBeNull();
   });
 
+  it('keeps the chat composer but hides its placeholder in the planning lane', async () => {
+    const harness = createProjectSupervisorRuntimeHarness({
+      planningV2Result: planningV2WorkingResult(),
+    });
+    await mountPlanningSurface(harness);
+
+    expect(screen.getByRole('textbox', { name: '项目需求' })).not.toBeNull();
+    expect(
+      screen.queryByText('告诉策划 Agent 接下来要做什么，或输入 @ 选择资源'),
+    ).toBeNull();
+    expect(
+      screen.queryByText('告诉项目总控接下来要做什么，或输入 @ 选择资源'),
+    ).toBeNull();
+  });
+
   it('still surfaces the clarification card on the planning lane', async () => {
     // 澄清卡是 V2 策划链路唯一需要用户动手的交互面之一。
     const harness = createProjectSupervisorRuntimeHarness({