Notifications for HivePress #7 in Email & Notifications

Adds on-site notifications with pop-ups and a notification history page, mirroring the emails that HivePress and its extensions already send. Every notification HivePress sends goes out as an email. This plugin listens to those emails and creates a matching on-site notification for whoever the email was addressed to, so users see what's happening without leaving the site. Because it works from the email layer rather than from each extension, it covers every extension that sends email, including any installed later. Nothing is hard-coded per extension. Pop-up notifications, with a countdown bar that pauses when hovered and a close button on each. A Notifications page under their account, grouped by date, with a filter by type. A settings page where they choose, per notification, whether they want it on-site, by email, by push, or not at all. On-site covers the notifications list, the bell menu and pop-ups. An unread count next to Notifications in the account menu. Mark one or all as read, and delete notifications they're finished with. Under HivePress Settings Notifications: Delivery - how often an open tab checks for new notifications, web push, the header bell and