A proper looking (fake) operating system

I’ve finished the third part of the tutorial series and I’ve heavily leaned into this cartoony MacOS / GNOME Linux rice aesthetic. The window is now fully movable through the toolbar and can also be closed with the button in the corner. I also added a taskbar to the bottom of the screen with the app names which I plan to replace with proper designed app icons by me. Alongside that, I want to

Refactor the JavaScript code, as I believe that some of the repetition can be solved by making classes, and..
Add the ability to pin and unpin apps on the taskbar.

Other than that, suggestions are appreciated as always!