host-nav：跳转标记只用真实 localStorage（maternal-bridge 镜像层会换掉 window.localStorage）+ cookie 兜底

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

topic/jisuan/index.html

@@ -45,7 +45,7 @@ button{font:inherit;border:0;background:none;color:inherit;cursor:pointer}
 .mb-brand{text-align:center;color:#C29A8F;font-size:11.5px;line-height:1.7}.mb-brand img{display:block;width:86px;height:auto;margin:0 auto 6px;opacity:.6}.mb-brand p{display:flex;align-items:center;justify-content:center;gap:8px;margin:0;letter-spacing:.06em}.mb-brand p::before,.mb-brand p::after{content:'';width:28px;height:1px;background:#EAD3CC}
 #scroll .mb-brand{margin:20px 0 0;padding-bottom:calc(120px + env(safe-area-inset-bottom))}   /* 给底部 Tab 让位 */
 </style>
-<script src="../../js/host-nav.js?v=26110907"></script>
+<script src="../../js/host-nav.js?v=26110908"></script>
 </head>
 <body>
 <div id="scroll">