Notifications

A user-initiated local-notification flow: inspect authorization, request it, show now, schedule, cancel, and receive the typed open callback.

Walkthrough

1. src/app.rs asks for permission only from the Request button.
2. Immediate and scheduled requests use stable IDs; cancellation addresses the same ID.
3. on_notification_opened reports the selected action after the app is opened.
4. tests/basic.rs covers the whole flow with TestRuntime; it does not claim OS delivery.

cargo check --all-targets
cargo test
cargo ferry build android
# macOS only
cargo ferry build ios --simulator

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