v26110903 补：12 个独立专题页、测一测页接 host-nav（容器页返回走 navigateBack），广场打开测试开容器页

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

topic/buji/index.html

@@ -171,6 +171,7 @@ b{color:var(--h)}
 .nu:active,.nc li:active{transform:scale(.98)}
 @media (prefers-reduced-motion:reduce){.fade,.fade .fi{opacity:1;transform:none;transition:none}}
 </style>
+<script src="../../js/host-nav.js?v=26110903"></script>
 </head>
 <body>
 <!-- 单色线性图标，stroke 1.8 -->
@@ -332,6 +333,7 @@ b{color:var(--h)}
 
   /* 返回：从首页点进来就 back；直接打开（分享 / 刷新）就回同目录的首页，身份原样带回 */
   $('#back').addEventListener('click', function () {
+    if (window.MBHost && MBHost.back(function () { location.href = '../../' + location.search + location.hash; })) return;   /* 11-09 容器页：回小程序上一页 */
     if (document.referrer && document.referrer.indexOf(location.host) >= 0 && history.length > 1) history.back();
     else location.href = '../../' + location.search + location.hash;
   });