Hub globe v2: mercator wrap, GPU path, landing layout updates.

Refine 3D globe rendering, layer CSS, landing page wiring and TOC UX.

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/hub-landing.js

@@ -108,7 +108,7 @@
     document.body.addEventListener('click', function (ev) {
       var t = ev.target.closest('[data-goto-page]');
       if (!t) return;
-      if (t.tagName === 'A' && t.getAttribute('href') === '#') {
+      if (t.tagName === 'A') {
         ev.preventDefault();
       }
       setActivePage(Number(t.getAttribute('data-goto-page')));