Added Beta Toggle button in user settings

[uzman2406]

Problem

Currently, there is no easy way for users to switch between the beta and production versions of ListenBrainz. This makes it inconvenient for users who want to test new features or move between environments.

LB-1611

Solution

I introduced a "Beta Toggle button" in the user settings that allows users to seamlessly switch between beta and production environments.
Screenshot:

• [✅] I have run the code and manually tested the changes

AI usage

• [✅ ] I did not use any AI

[anshg1214]

@uzman2406 Have you checked how the beta toggle button on MusicBrainz behaves?

[uzman2406]

Thanks for the review @anshg1214 . I saw the UI of musicbrainz not the codebase . However I just took a look in the codebase of musicbrainz , I see that it uses backend endpoint to persists the user preference and then redirects accordingly and I’ve currently implemented this as a frontend-only toggle that redirects based on the current URL , since I can't find an equivalent backend endpoint.
Would you prefer that I introduce a similar backend approach for ListenBrainz as well, or keep this as a simpler client-side switch for now?

[anshg1214]

Yes, it makes sense to persist this information in the backend.