[DESKTOP] Better Client

[pfanzola]

Hi, thanks for ente photos (& auth) I appreciate that now both are verified on flathub
Here's some improvements that would give a better experince on the linux desktop:

• support the native global title bar and the configurations of it, let DE's the syle and the configuarations of it
• support the background apps portal for GNOME, for making an example something that telegram does, providing an option to unshow the tray icon and instead uses the background apps portal for backgroung management

Thanks for your hard work hoping you will consider it.