Allow window mode

[aristidesstaffieri]

What problem does your feature solve?

Allows Freighter to run in "window mode" which pops out a panel that is not attached to the current window, this makes it easier to use other extensions while using a wallet, like password managers.

What would you like to see?

A setting to open Freighter in window mode.

What alternatives are there?

Closing Freighter before using other extensions, then re-opening it.