style(mpuniapp): 修复移动端视口安全区避让、触控热区与零Emoji规范并完善UI/UX测试覆盖

mpuniapp/pages/common/login.uvue

@@ -389,7 +389,8 @@ onUnmounted(() => {
   align-items: center;
   box-sizing: border-box;
   padding-inline: var(--oc-space-16, 16px);
-  padding-block: 16px 36px;
+  padding-top: 16px;
+  padding-bottom: calc(36px + env(safe-area-inset-bottom, 0px));
   overflow-x: hidden;
 }