Add web notifications for iOS

[jasikpark]

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I would like to receive notifications from Hydrogen on iOS if I've enabled it.

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Fix the implementation of notifications to support iOS Safari 16.4

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https://developer.apple.com/documentation/usernotifications/sending_web_push_notifications_in_web_apps_safari_and_other_browsers

[jasikpark]

currently on iOS, it does prompt for permission and render the current "granted" state correctly, but the worker/notif service doesn't seem to run