收口前端平台组件能力

新增 PlatformAsyncStatePanel 统一 profile 异步状态骨架
扩展 PlatformSegmentedTabs 支持滚动 tab 并接入创作入口与发现页
统一 PixelCloseButton 复用 PlatformModalCloseButton 像素关闭能力
抽取平台入口泥点前置提示弹层并收紧阻断语义
补充组件收口文档与共享决策记录

src/components/CharacterChatModal.test.tsx

@@ -1,6 +1,7 @@
 /* @vitest-environment jsdom */
 
 import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
 import { expect, test, vi } from 'vitest';
 
 import type { CharacterChatModalState } from '../hooks/rpg-runtime-story';
@@ -110,3 +111,27 @@ test('角色聊天状态、空态和建议复用暗色 UI Kit chrome', () => {
   expect(draftTextarea.className).toContain('platform-text-field--editor-dark');
   expect(draftTextarea.className).toContain('focus:border-sky-300/35');
 });
+
+test('角色聊天标题栏内联关闭按钮保持共享关闭行为', async () => {
+  const user = userEvent.setup();
+  const onClose = vi.fn();
+
+  render(
+    <CharacterChatModal
+      modal={createModalState()}
+      onClose={onClose}
+      onDraftChange={vi.fn()}
+      onUseSuggestion={vi.fn()}
+      onRefreshSuggestions={vi.fn()}
+      onSendDraft={vi.fn()}
+    />,
+  );
+
+  const closeButton = screen.getByRole('button', { name: '关闭角色聊天' });
+  await user.click(closeButton);
+
+  expect(closeButton.className).toContain('relative');
+  expect(closeButton.className).toContain('shrink-0');
+  expect(closeButton.getAttribute('title')).toBe('关闭角色聊天');
+  expect(onClose).toHaveBeenCalledTimes(1);
+});