fix(h5): 首页锁外层滚动+关 overscroll 回弹(修可下拽致顶部下移)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

h5/home/index.html

@@ -4793,8 +4793,9 @@ body.transitioning-tab { /* no animation */ }
 body { /* nav-fade-in disabled — tab 切换闪烁源头 */ }
 </style>
 <style>
-html,body{background:#fff;display:block;min-height:100%;height:100%;margin:0;cursor:auto}
+html,body{background:#fff;display:block;height:100%;margin:0;cursor:auto;overflow:hidden;overscroll-behavior:none}
 .device{width:100%;height:100%;border-radius:0;box-shadow:none}
+.screen,.home-scroll{overscroll-behavior:none;-webkit-overflow-scrolling:touch}
 #variantToggle,#debugBack{display:none!important}
 .tab-bar{display:none!important}  /* 底栏归原生壳:隐藏 H5 原型自带 tabbar,修双底栏 */
 </style>