继续补齐个人中心弹窗底部插槽

扩展 PlatformProfileModalShell 透传共享 footer 插槽能力
将昵称修改弹窗改为使用标准 profile modal footer
补充 modal shell 与昵称弹窗的 footer 接法回归测试
更新 PlatformUiKit 收口计划与共享决策记录

src/components/platform-entry/PlatformProfileModalShell.test.tsx

@@ -0,0 +1,39 @@
+/* @vitest-environment jsdom */
+
+import { render, screen } from '@testing-library/react';
+import { expect, test, vi } from 'vitest';
+
+import { PlatformActionButton } from '../common/PlatformActionButton';
+import { PlatformProfileModalShell } from './PlatformProfileModalShell';
+
+test('PlatformProfileModalShell forwards footer content into shared modal footer chrome', () => {
+  render(
+    <PlatformProfileModalShell
+      title="修改昵称"
+      onClose={vi.fn()}
+      panelClassName="platform-remap-surface !max-w-sm rounded-[1.4rem]"
+      bodyClassName="px-5 py-5"
+      footerClassName="grid grid-cols-2 gap-3 px-5 pb-5 pt-0 sm:px-5"
+      footer={
+        <>
+          <PlatformActionButton tone="secondary">取消</PlatformActionButton>
+          <PlatformActionButton>保存</PlatformActionButton>
+        </>
+      }
+    >
+      <div>昵称输入区</div>
+    </PlatformProfileModalShell>,
+  );
+
+  const dialog = screen.getByRole('dialog', { name: '修改昵称' });
+  const body = screen.getByText('昵称输入区').parentElement;
+  const footerButton = screen.getByRole('button', { name: '保存' });
+  const footer = footerButton.closest('div');
+
+  expect(dialog).toBeTruthy();
+  expect(body?.className).toContain('px-5');
+  expect(body?.className).toContain('py-5');
+  expect(footer?.className).toContain('border-t');
+  expect(footer?.className).toContain('grid');
+  expect(footer?.className).toContain('pt-0');
+});