Wait for the acknowledged knowledge manager state in regression check

tests/unit/cloud-knowledge-picker.test.tsx

@@ -277,7 +277,7 @@ it('preserves uncertain processing while refreshing and releases it when the ser
   files = [{ ...uploaded, processing_task: { task_id: 'observed-new-task', status: 'pending', error: null } }];
   fireEvent.click(screen.getByRole('button', { name: '刷新状态' }));
   await screen.findByText('等待处理');
-  expect(screen.getByRole('combobox', { name: '管理的知识库' })).toBeEnabled();
+  await waitFor(() => expect(screen.getByRole('combobox', { name: '管理的知识库' })).toBeEnabled());
 });
 
 it('retains unconfirmed operations in a disabled manager if its owned library disappears and requires explicit discard', async () => {