feat(mpuniapp): 重构登录页面为瑞士国际主义极简品牌感，优化宽屏居中与移动端自适应

mpuniapp/pages/common/login.uvue

@@ -190,7 +190,7 @@ const isRtlMode = computed((): boolean => {
 });
 
 function t(key: LoginCopyKey | string): string {
-  return resolveLoginText(key);
+  return resolveLoginText(key, currentLang.value);
 }
 
 const codeButtonText = computed((): string => {

mpuniapp/pages/common/useLogin.uts

@@ -3,7 +3,7 @@
  * 第一版可用骨架：不接真实 Google / Apple SDK，不伪造成功登录
  */
 
-import { getCurrentLocale, getOmniText } from '../../common/locale.uts';
+import { getCurrentLocale, getOmniText, OmniLocale } from '../../common/locale.uts';
 import { setAuthToken, setTenantId } from '../../common/request.uts';
 
 export type LoginTab = 'phone' | 'email';
@@ -55,12 +55,13 @@ function isZhLocale(): boolean {
 /**
  * 登录文案：能复用 locale.uts 的走词典，缺 key 时中英简单分支
  */
-export function resolveLoginText(key: LoginCopyKey | string): string {
+export function resolveLoginText(key: LoginCopyKey | string, targetLocale?: string): string {
+  const loc = targetLocale != null && targetLocale !== '' ? targetLocale : getCurrentLocale();
   if (key === 'loginSuccess') {
-    return getOmniText(getCurrentLocale(), 'common.success');
+    return getOmniText(loc as OmniLocale, 'common.success');
   }
 
-  const zh = isZhLocale();
+  const zh = loc === 'zh-CN';
   if (key === 'title') {
     return zh ? '登录 OmniCard' : 'Sign in to OmniCard';
   }