QUESTION: After session/token from Spotify expires, does requesting a new session/token always opens and switches to the Spotify App?

I would like to be able to request a new session/token from Spotify without switching to the Spotify app.
This might be related to:
https://github.com/cjam/react-native-spotify-remote/issues/42#issuecomment-820449988

Here are what I'm confused about:

1. Is there a way to prevent having to always open the Spotify App? Is that what the refresh-token is for?
2. If refresh-token / renew session is the way, it seems we have to implement/call the refresh token mechanism ourselves atm - it is not part of the example.
3. How long a life does the refresh-token have before it expires as well?