Custom title bar

[esimkowitz]

Right now, I am using the standard Tauri window title bar, but I want to make a custom one that i can put the sidebar collapse button (#59) and the widget title inside.

[esimkowitz]

Look at how Ebou does custom title bars: https://github.com/terhechte/Ebou/blob/main/src/environment/native/platform/macos.rs