Enhancement: Display application title in main window
Currently, the main application window has no title in the topbar, which might make it hard to find for some users. This is also just wasted space.
Furthermore, having the application name as the title here would help users to better associate the application with its name. I, for one, occasionally forget the name of this application, so I look up "password" in GNOME's search to find it. I believe that if Secrets had its name in this topbar and I saw it every time I used it, I would be able to more strongly associate this app's functionality with it's proper name.
I also noticed that on the login screen, it only displays the filename in the topbar. I'd like it if you could build on this, and instead, place the title "Secrets" up there, and use the subtitle feature to display the filename below the title, both in the login screen, and the main window. This way, users can always associate with the application name, and see their safe file at a glance without needing to go back to the login screen.