With ssr:false, the sidebar rendered nothing in server HTML, so the
content area took full width and page content (site name "Ciphera")
appeared in the sidebar zone. Now the dynamic import has a loading
placeholder — a 64px div with matching border/background that reserves
the sidebar space in the server HTML. Content area never occupies the
sidebar zone. Sidebar replaces the placeholder on client mount.
6d649d8dc4