feat: use Talk apps as guest users | join public conversations from clients

[frake65]

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Feature request

When I send out my invitation (public link) for a conversation to a guest user that does not have any account on my Nextcloud server, the user can only take part using a browser. - I'd rather give them the opportunity to use one of the Nextcloud Talk apps instead. Especially on smartphones, but also on desktop environments it would be a great enhancment, if using the Talk app would be possible without login.

Related issues:

Web:

• Feature Request: Client Chooser Landing Page #13902

Talk Desktop:

• Connect to a public chat as a guest talk-desktop#814

Talk Android:

• Add ability to join public calls without an account talk-android#261

Talk iOS:

• Accept links for public chats talk-ios#119
• iOS app: two feature requests talk-ios#1892

[basic-settings]

We're looking to migrate our community-sportsclub to Talk.

For some public events we allow non-members to join, and we have some public channels where they can chat with other members of the community (via the invite link+password). Being limited to just the webbrowser is not very attractive, especially when everyone is using their smartphones.

This would be a fantastic feature, from an usability improvement to giving communities better engagement options.

[Antreesy]

Since it might be cumbersome to search for an open issues, converting it to overview