[Feature] Tray Unread Private Messages Count

A clear and concise description of the feature you'd like to see

The title is pretty self-descriptive, but yeah.. It would be pretty great to get the counter like on Discord on Windows. That would count only private messages or mentions.

Like this

Implementation Notes

It might use tray image, but with numbers overlayed over that image.

Additional context

No response

Request Agreement

• I've searched existing issues and this hasn't been suggested before
• This is a core modification feature, not a plugin request (those go in Discord)
• This feature would benefit most users, not just a specific use case
• I am willing to work on this myself