收口首页与详情动作按钮

为 CopyFeedbackButton 增加 actionShape 共享能力
将拼图广场详情 hero 动作迁移到共享按钮组件
将智能创作首页与抽屉入口迁移到共享按钮组件
将绑定手机号身份提示块迁移到 PlatformSubpanel
同步更新 PlatformUiKit 收口文档与团队决策记录

src/components/common/CopyFeedbackButton.test.tsx

@@ -103,6 +103,7 @@ test('can opt into platform action button chrome', () => {
       state="idle"
       idleLabel="复制报错"
       actionSurface="platform"
+      actionShape="pill"
       actionFullWidth
     />,
   );
@@ -111,6 +112,7 @@ test('can opt into platform action button chrome', () => {
 
   expect(button.className).toContain('platform-button--primary');
   expect(button.className).toContain('w-full');
+  expect(button.className).toContain('rounded-full');
   expect(button.className).toContain('disabled:cursor-not-allowed');
 });