Improve error handling

Errors should be handled internally by the application as best as possible, but often they are not possible to be fixed by the app itself (e.g., a user removes Palbum access to his Spotify account).

Currently, this type of errors is _handled_ by `console.error`. I do not particularly like this solution, because the user is not aware of what it is going on even when he can fix it.

Having some sort of visual hint presented to the user (e.g., a message) can improve the user experience and give him more control.