Great review and nice design!
I would add:
* The nsec generation is a needed and crucial function (I was thinking to add it to nos2x), I would add some informations about what it is and how to keep it secure;
* The possibility to download the nsec in a txt would be nice, and more secure that copy it to the clipboard;
* If there are no profiles show immediatly the form with a prefilled nsec, instead of a empty panel;



