[FR]: Android SSO using native Nextcloud Files App

### Describe the feature you'd like to request

I'd like to utilize native SSO meaning that on Android I can reuse the same account used to sign in to the nextcloud files app

### Describe the solution you'd like

The nextcloud team provides an official [API for SSO](https://github.com/nextcloud/Android-SingleSignOn?tab=readme-ov-file#how-to-use-this-library) that utilizes the account used by the official nextcloud files app. That way anyone using the nextcloud files app can sign into further apps without having to enter nextcloud credentials again

### Describe alternatives you've considered

An alternative is already implemented that utilizes the browser SSO feature. However, typical android users do not access nextcloud using their webbrowser but rather using the files app.

Start with the Android-SingleSignOn API linked in the issue and inspect the existing browser SSO implementation. Determine how the native Nextcloud Files account can be reused on Android, then verify that users with the Files app can sign in without entering their Nextcloud credentials again.

Written by the indexing model from the issue text.