继续收口账号空态与运行态动作按钮

账号安全面板空态统一复用 PlatformEmptyState
登录入口不可用提示改为复用 PlatformEmptyState
RPG运行态底部与覆盖层动作统一委托 PlatformActionButton
背包工坊按钮回到共享 success tone
更新 PlatformUiKit 收口文档与团队决策记录

src/components/auth/LoginScreen.tsx

@@ -16,11 +16,11 @@ import {
   readStoredLegalConsent,
 } from '../common/legalDocuments';
 import { PlatformActionButton } from '../common/PlatformActionButton';
+import { PlatformEmptyState } from '../common/PlatformEmptyState';
 import { PlatformFieldLabel } from '../common/PlatformFieldLabel';
 import { PlatformModalCloseButton } from '../common/PlatformModalCloseButton';
 import { PlatformSegmentedTabs } from '../common/PlatformSegmentedTabs';
 import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
-import { PlatformSubpanel } from '../common/PlatformSubpanel';
 import { PlatformTextField } from '../common/PlatformTextField';
 import { CaptchaChallengeField } from './CaptchaChallengeField';
 
@@ -374,14 +374,13 @@ export function LoginScreen({
               !phoneLoginEnabled &&
               !wechatLoginEnabled &&
               !miniProgramRuntime ? (
-                <PlatformSubpanel
-                  as="div"
-                  radius="sm"
-                  padding="none"
-                  className="px-4 py-4 text-sm text-[var(--platform-text-base)]"
+                <PlatformEmptyState
+                  surface="subpanel"
+                  size="compact"
+                  className="px-4 py-4"
                 >
                   当前登录入口暂不可用。
-                </PlatformSubpanel>
+                </PlatformEmptyState>
               ) : null}
             </div>
           )}