* Convert all top-level arrow functions to regular functions
* Refactor webPush.sendNotification call
* Refactor webPush logging
* Rename var to title
* Rewrite service worker
This rewrite simplifies the service worker by removing
* merging of push notifications via tag property
* badge count
These features weren't properly working on iOS. We concluded that we don't really need them.
For example, this means replies will no longer get merged to "you have X new replies" but show up as individual notifications.
Only zaps still use the tag property so devices that support it can still replace any previous "your post stacked X sats" notification for the same item.
* Don't use async/await in service worker
* Support app badge count
* Fix extremely slow notificationclick
* Fix serialization and save in pushsubscriptionchange event
* First pass of implementing Badging API for notifications
* Only show app badge when driven from push notifications
* Display number of unread push notifications instead of just an empty badge
Clear badge via postMessage when notifications page is loaded
* de-dupe some code, update badge counter on each notification click
* remove ids, track open note count instead
* restore optional chaining
* ensure note count doesn't go below 0, and fix event.waitUntil error when clearing badge
* incorporate PR feedback
