Bring 'Focus mode' from Chrome/Firefox extension to the desktop app

[samwzlim]

💻 Environment

Platform: macOS and Windows (since I daily drive both). Linux too, why not!

📒 Description

Bring 'focus mode' from Chrome/Firefox extension over to desktop app. toggl/toggl-button#1590

⭐️ Why do you want this?

I use the pomodoro technique when tracking my time using Toggl Track, and the 'focus mode' countdown is really helpful in showing me how much time I have left until the end of my session. I use the desktop app and prefer it over the extension, so I hope this feature can be ported over to the desktop apps.