Hide the top bar on the home page

Visitors see the home page with no top bar at all. Signed in, the bar
sits behind a small tab at the top center that drops it down; Escape or
a click outside closes it. Every other page keeps the regular bar.

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

web/static/js/common.js

@@ -189,3 +189,16 @@ document.addEventListener("click", (e) => {
     if (!d.contains(e.target) || e.target.closest(".menu-pop a")) d.open = false;
   }
 });
+
+// The home page's drop-down top bar closes on Escape or a click outside it.
+document.addEventListener("click", (e) => {
+  const d = document.querySelector("details.topbar-drawer[open]");
+  if (d && !d.contains(e.target)) d.open = false;
+});
+document.addEventListener("keydown", (e) => {
+  const d = document.querySelector("details.topbar-drawer[open]");
+  if (e.key === "Escape" && d) {
+    d.open = false;
+    d.querySelector("summary").focus();
+  }
+});