pub fn note_navigation(route: &str, label: Option<&str>)Expand description
Announce a navigation to route from its SOURCE — a nav host (the sidebar selector) calls
this the instant it changes the bound selection, so the observer sees it synchronously instead
of waiting for the route to settle into NAV_STACK a frame later (which maybe_notify_route_change
reads). Deduped like the pump-boundary path. route is the host’s local key, which replays as a
relative navigate (innermost-first) — correct for both a top-level sidebar and a nested one.