Window title remains to show the old project filename after choosing "New project"

[anssip]

Window title remains to show the old project filename after choosing "New project". It should empty the title and behave like applications usually behave when "New project" is selected from the menu.

Other things also seem to be broken when trying to create a new project after some existing project has already been open. The environment variables are not cleared when a new project is initialised.

Overall, the app should handle an empty state (no requests, no env, no context, no auth) better.