收起空公告栏占位

无公告时启动器主区域不再启用公告布局。

调整账户条和首页输入区域的无公告顶部间距。

补充启动器无公告布局回归测试。

apps/ai-game-creator-shell/src/App.tsx

@@ -2225,7 +2225,13 @@ export function WorkspaceLauncher({
           <Settings size={16} aria-hidden="true" />
         </button>
       </aside>
-      <section className="launcher-main">
+      <section
+        className={
+          launcherNotifications.length > 0
+            ? 'launcher-main launcher-main-with-promo'
+            : 'launcher-main'
+        }
+      >
         {launcherNotifications.length > 0 ? (
           <header className="launcher-promo" aria-label="通知">
             {launcherNotifications.map((notification) => (

apps/ai-game-creator-shell/src/styles.css

@@ -320,7 +320,7 @@ textarea {
 
 .launcher-account-bar {
   position: absolute;
-  top: 44px;
+  top: 16px;
   right: 22px;
   display: flex;
   align-items: center;
@@ -328,6 +328,10 @@ textarea {
   z-index: 2;
 }
 
+.launcher-main-with-promo .launcher-account-bar {
+  top: 44px;
+}
+
 .launcher-account-bar span,
 .launcher-account-bar button {
   height: 24px;
@@ -366,7 +370,11 @@ textarea {
   justify-items: center;
   gap: 13px;
   min-height: 374px;
-  padding: 135px 24px 18px;
+  padding: 103px 24px 18px;
+}
+
+.launcher-main-with-promo .launcher-hero {
+  padding-top: 135px;
 }
 
 .launcher-hero-title {
@@ -952,6 +960,10 @@ textarea {
     padding: 84px 14px 34px;
   }
 
+  .launcher-main-with-promo .launcher-hero {
+    padding-top: 84px;
+  }
+
   .launcher-hero-title {
     flex-direction: column;
     gap: 10px;

apps/ai-game-creator-shell/tests/appSurface.test.ts

@@ -686,6 +686,12 @@ describe('AI 游戏创作 App 界面边界', () => {
 
     expect(screen.getByLabelText('项目启动器')).not.toBeNull();
     expect(screen.queryByLabelText('通知')).toBeNull();
+    expect(
+      screen
+        .getByLabelText('项目启动器')
+        .querySelector('.launcher-main')
+        ?.className.includes('launcher-main-with-promo'),
+    ).toBe(false);
     expect(screen.queryByLabelText('聊天')).toBeNull();
     fireEvent.change(screen.getByLabelText('项目目录'), {
       target: { value: '/tmp/authorized-game' },