收口创作代理聊天面板组件

creation-agent 工作台聊天区外壳改用 PlatformSubpanel

工作台测试断言消息列表接入公共子面板外壳

补充 PlatformUiKit 收口文档和 Hermes 决策记录

src/components/creation-agent/CreationAgentWorkspace.test.tsx

@@ -85,6 +85,11 @@ test('creation agent workspace keeps initial chat progress at zero percent', ()
     'creation-agent-progress-label',
   );
   expect(progressbar.className).toContain('platform-progress-track');
+  expect(
+    screen
+      .getByTestId('creation-agent-message-list')
+      .closest('.platform-subpanel')?.className,
+  ).toContain('rounded-[1.5rem]');
   expect(
     (progressbar.firstElementChild as HTMLElement | null)?.style.width,
   ).toBe('0%');

src/components/creation-agent/CreationAgentWorkspace.tsx

@@ -562,7 +562,12 @@ export function CreationAgentWorkspace({
 
       <CreationAgentOperationBanner operation={activeOperation} />
 
-      <div className="min-h-0 flex-1 overflow-hidden rounded-[1.6rem] border border-[var(--platform-subpanel-border)] bg-[var(--platform-subpanel-fill)]">
+      <PlatformSubpanel
+        as="div"
+        radius="xl"
+        padding="none"
+        className="min-h-0 flex-1 overflow-hidden"
+      >
         <div className="flex h-full min-h-0 flex-col">
           <div
             ref={messageListRef}
@@ -704,7 +709,7 @@ export function CreationAgentWorkspace({
             </div>
           </div>
         </div>
-      </div>
+      </PlatformSubpanel>
     </div>
   );
 }