Module registry 

ToastRegistry — the app-singleton service handle.

Registered into the app-state registry by install_toast(opts) (lives in the teksilo umbrella). Holds the queue + per-entry state shared between:

• crate::toast::ext::EventContextToastExt — looks up the registry to fulfil ctx.show_toast(toast).
• crate::toast::host::ToastHost — reads live_entries to render each rebuild, owns the per-frame timer, and registers itself here in build() so show_toast can find it.
• crate::toast::surface::ToastSurface — calls back into the registry to dismiss its entry on close-click / action-invoked.

Routing: every live entry (and its mirrored archive row) carries a resolved ToastRoute — the presenting window by default, or an explicit audience/broadcast target. max_visible admission and High/Urgent eviction are bucketed per route (see ToastRegistry::enqueue) so a burst of one window’s/audience’s toasts can never starve another’s slot pool. ToastHost does the complementary filtering on the render side.

Structs

ToastRegistry

Cheap to clone (Rc<RefCell<…>>). All public methods take &self and use interior mutability.