Declarative banner trigger - renders nothing, shows/dismisses a global banner
when [when] changes.
When [when] becomes true, the banner appears. When false, it is dismissed.
The banner's lifecycle is tied to the signal - perfect for reactive system state
like isOffline() or sessionExpiring().
Requires provideFeedback(withBanners()).
<cngx-banner-trigger [when]="isOffline()" message="You are offline. Changes will sync when reconnected." id="net:offline" severity="error" /><cngx-banner-trigger [when]="sessionExpiring()" message="Session expires soon." id="auth:session" severity="warning" actionLabel="Extend" [actionHandler]="extendSession" />