修复游戏创作页头按钮样式

恢复 Tailwind Preflight 后的页头操作按钮边框与间距
补充页头按钮样式与禁用态回归测试

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

@@ -561,6 +561,7 @@ textarea {
 }
 
 .launcher-page-actions button,
+.launcher-page .launcher-project-list-actions button,
 .launcher-project-table article > button,
 .launcher-empty-projects button {
   height: 32px;
@@ -572,6 +573,11 @@ textarea {
   font-size: 12px;
 }
 
+.launcher-page .launcher-project-list-actions button:disabled {
+  cursor: not-allowed;
+  opacity: 0.55;
+}
+
 .launcher-page-actions button:last-child {
   border-color: #111827;
   background: #111827;

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

@@ -13642,6 +13642,23 @@ describe('AI 游戏创作 App 界面边界', () => {
     expect(styles).toMatch(/\.message\s*\{[^}]*overflow-wrap:\s*anywhere/s);
   });
 
+  it('keeps launcher page header actions styled after Tailwind preflight', () => {
+    const styles = readFileSync(
+      resolve(process.cwd(), 'apps/ai-game-creator-shell/src/styles.css'),
+      'utf8',
+    );
+    const headerActionRule = styles.match(
+      /\.launcher-page \.launcher-project-list-actions button,[^{]*\{([^}]*)\}/s,
+    );
+
+    expect(headerActionRule?.[1]).toContain('padding: 0 12px;');
+    expect(headerActionRule?.[1]).toContain('border: 1px solid #d8dde5;');
+    expect(headerActionRule?.[1]).toContain('background: #fff;');
+    expect(styles).toMatch(
+      /\.launcher-page \.launcher-project-list-actions button:disabled\s*\{[^}]*cursor:\s*not-allowed;[^}]*opacity:\s*0\.55;/s,
+    );
+  });
+
   it('shows developer panels only in dev mode', () => {
     renderAppAt('/?dev');