Add notification toggle feature with mute support and integrate with service worker:

- Implement `NotificationToggle` component to manage notification permissions and mute state.
- Add `notificationService` to handle browser notification permissions and mute state storage.
- Update service worker (`sw.js`) to respect app-level mute state for push notifications.
- Register and synchronize mute state with the service worker in `main.tsx`.
- Enhance `LiveView` to check mute state before sending summary updates to the service worker.
- Adjust notification paths and assets for consistency with app-wide structure.