canActivate guard: see AuthManager.xml header. Invoked by the router on the render thread during navigateTo, once per guarded route. A cheap SYNCHRONOUS token check only, no network (launch-time AboutMe re-validation stays in the login flow).

currentRequest is the route object the router is resolving; currentRequest.path is the full requested path (incl. any query string), which is exactly what we stash so the post-login replay can resume the original destination.

Returns: true : token present: allow the navigation. { path: "/login" } : no token: stash the requested path for post-login replay and redirect to /login. The router treats any AA with a non-empty path as a redirect command (Router.brs sgrouter_runGuardChecks), the same shape sgrouter.createRedirectCommand("/login") produces, without pulling the whole router namespace into this guard node.