Notification updates to favicon, title and windows badge overlay

Design have reviewed the the experience of notification badges on web/desktop and would like to make the following changes

## Favicon/Title
**Old UX**

**New UX**

- [x] ~~TODO: Check gap in design. The design doesn't include the room name, will check if that is an omission or intended.~~ Confirmed it will have the same info as today but the notification number will be on the left.

## Windows overlay badge

Currently the badge overlay we support for windows attempts and fails to render mutli-digit icons in a similar style to favicons currently:

This will be updated to only display "1" - "99+" to match what[native windows notifications support](https://learn.microsoft.com/en-us/windows/apps/develop/notifications/badges).