Minimize active window by clicking on the tray icon.

[tegridyfarmer]

Problem Statement

Currently the tray icon only allows opening the superProductivity app, but you would expect clicking on it again to close the superProductivity window.

❔ Possible Solution

If the window is opend a click on the tray icon should minimize the superProductivity screen.
It should probably also show "Hide app" instead of "Show app"when there is a open window.

⤴️ Describe alternatives you've considered

➕ Additional context

The signal-desktop appliation has the features I described implemented.

[github-actions]

Thank you very much for opening up this issue! I am currently a bit overwhelmed by the many requests that arrive each week, so please forgive me, if I fail to respond personally. I am still very likely to at least skim read your request and I'll probably try to fix all (real) bugs if possible and I will likely review every single PR being made (please, give me a heads up if you intent to do so) and I will try to work on popular requests (please upvote via thumbs up on the original issue) whenever possible, but trying to respond to every single issue over the last years has been kind of draining and I need to adjust my approach for this project to remain fun for me and to make any progress with actually coding new stuff. Thanks for your understanding!