Two "current server" notions diverged: the sidebar switcher (session active_server_id)
vs the server-details URL. Now viewing a server's details sets it active (sidebar
always matches the page), and switching the sidebar while on a details page navigates
to the chosen server (instead of reloading the old one). One current server, in sync.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>