User view: always show prev-next

[distantnative]

Description

Summary of changes

• Prev/next arrows are shown on any user view, also the account view
• $user->next(), $user->prev() are based on a siblings collection that now is sorted by username (not id)

Reasoning

• Current state has been too confusing. Maybe the new solution isn't the best one can imagine, but I'd argue better and a lot less confusing.
• Prev/next arrows should move through the same list as shown on users view. That's why the sorting needs to be added to User::siblingsCollection() too.

Additional context

• I think we can improve this a lot more easily once we have view UI classes. That will allow us e.g. to have specific routes for the user view but when filtered by a specific role, where the prev-next arrows could then loop only through the users with that role.

Changelog

Enhancements

• User view: show prev/next buttons also on account view

For review team

• Add changes & docs to release notes draft in Notion

[bastianallgeier]

I think the most confusing part is that we jump to the account view for the current user. We should probably separate this and have an account view and a user view for the current user.

[distantnative]

@bastianallgeier I think I found a relatively simple way that seems to work

[bastianallgeier]

The option idea is great. But unfortunately, we can't simply change the path method like that. It's needed in other places as well. I guess it's best to untangle that as well in this PR.

[distantnative]

@bastianallgeier removed that part again. I still think that this PR improves the situation, even if it's not the perfect result.

[afbora]

I like this solution. It's easy and simple 👍

If we're still not sure and it confusing, I have an another idea that remove current user from users collection only for the pagination. Maybe it's stupid idea 🙈