继续收口平台空态与动作按钮

作品架异步状态切换复用 PlatformAsyncStatePanel
复制反馈动作外观改为组合 PlatformActionButton
结果页与调试面板空态继续收口到 PlatformEmptyState
暗色私聊与工坊按钮改为复用 PlatformActionButton
更新 PlatformUiKit 收口文档与团队决策记录

src/components/puzzle-result/PuzzleResultView.test.tsx

@@ -81,7 +81,7 @@ function stubReferenceImageUpload(dataUrl: string) {
   vi.stubGlobal('FileReader', MockFileReader as unknown as typeof FileReader);
 }
 
-test('renders missing draft notice with shared PlatformSubpanel chrome', () => {
+test('renders missing draft notice with shared PlatformEmptyState chrome', () => {
   render(
     <PuzzleResultView
       session={{ ...createSession(), draft: null }}
@@ -92,11 +92,12 @@ test('renders missing draft notice with shared PlatformSubpanel chrome', () => {
 
   const noticePanel = screen
     .getByText('还没有可编辑的拼图草稿')
-    .closest('.platform-subpanel');
+    .closest('.platform-empty-state');
 
+  expect(noticePanel?.className).toContain('platform-empty-state');
   expect(noticePanel?.className).toContain('rounded-[1rem]');
-  expect(noticePanel?.className).toContain('sm:p-5');
-  expect(noticePanel?.className).toContain('text-[var(--platform-text-base)]');
+  expect(noticePanel?.className).toContain('py-5');
+  expect(noticePanel?.className).toContain('text-[var(--platform-text-soft)]');
 });
 
 function createSession(