Add companion application

assets/page/fab.js

@@ -0,0 +1,18 @@
+// Lift the floating action button above the footer when the footer is on
+// screen, so it never overlaps the request-time line or the companion icon.
+// Mirrors the TOC's header-aware top-offset behaviour in toc.js.
+(function () {
+    var fab = document.querySelector(".fab");
+    var footer = document.querySelector("footer");
+    if (!fab || !footer) return;
+
+    function updateBottom() {
+        var rect = footer.getBoundingClientRect();
+        var overlap = Math.max(0, window.innerHeight - rect.top);
+        fab.style.bottom = (overlap + 16) + "px";
+    }
+
+    window.addEventListener("scroll", updateBottom, { passive: true });
+    window.addEventListener("resize", updateBottom);
+    updateBottom();
+})();