Fix notification issues

[axpoems]

Remaining issues in the notification system that needs fixing:

• Sometimes 'Leave chat' message is not sent.
• Sometimes reset button is not resetting everything (this applies only to the tab badge)
• Sometimes seeing this: every time I receive a new PM, I get notified for all of the ones I haven't yet read + that one
• Corner cases that need special handling:
  • What do to once a user leaves a trade chat?
  • What do to once a user leaves private chat?

[axpoems]

I can look into this and propose UX solution for the unhandled scenarios.

[HenrikJannsen]

See also https://github.com/bisq-network/bisq2/issues/1361, https://github.com/bisq-network/bisq2/issues/1546 , https://github.com/bisq-network/bisq2/issues/1866, https://github.com/bisq-network/bisq2/issues/1876