Don't reopen the mobile menu on Back

The menu state became "open for this path", derived against the current
pathname so the overlay disappears as soon as a navigation commits. But
the path was never forgotten, so navigating Back to the page the menu was
opened on brought the menu back with it. Clear it once the path changes.

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

Author: gaearon

src/components/Layout/TopNav/TopNav.tsx

@@ -169,6 +169,11 @@ export default function TopNav({
   const [showSearch, setShowSearch] = useState(false);
   const [isScrolled, setIsScrolled] = useState(false);
   const scrollParentRef = useRef<HTMLDivElement>(null);
+  // Deriving from the path hides the menu as soon as a navigation commits.
+  // Forget the path afterwards, so going Back doesn't reopen the menu.
+  if (openMenuPath !== null && openMenuPath !== asPath) {
+    setOpenMenuPath(null);
+  }
   const isMenuOpen = openMenuPath === asPath;
   const {breadcrumbs} = getRouteMeta(asPath, routeTree);