Remove remaining mentions of fabs

assets/overlay.js

@@ -26,7 +26,7 @@
 
         closeBtn = document.createElement('button');
         closeBtn.type = 'button';
-        closeBtn.className = 'btn btn-fab overlay-close';
+        closeBtn.className = 'btn overlay-close';
         closeBtn.title = 'Close';
         closeBtn.setAttribute('aria-label', 'Close');
         closeBtn.textContent = '×';
@@ -35,11 +35,6 @@
 
         bodyEl = document.createElement('div');
         bodyEl.className = 'overlay-body';
-        // Any navigation or anchor activation inside a rail dismisses the
-        // overlay: tree/calendar links navigate away, TOC links scroll the
-        // page underneath — either way the user should see the result, and
-        // closing synchronously (before navigation) avoids a bfcache snapshot
-        // that would restore the overlay open on back-nav.
         bodyEl.addEventListener('click', function (e) {
             if (e.target.closest('a')) close();
         });