Share favorite locations

My understanding is that currently the only way to share static locations stored in a user's "favorites" is by exporting them to a GPX-formatted file, either exporting all favorites or favorites in a selected category. This GPX file may then be shared in the standard ways file sharing is supported in Nextcloud.

It would be very useful to have the ability to share a favorite group "directly" with either (1) Nextcloud account holders (the same way files can be shared with access control based on authenticated Nextcloud accounts) or (2) via public link, where the practically-impossible-to-guess shared link opens the Maps app in a public view-only mode that displays the shared favorites group on the map. In the case of shares with local Nextcloud account holders, the shared favorites would appear alongside the user's own favorites, perhaps under a collapsible/toggleable "Locations shared with you" navigation section.

The issue does not name files, tests, or entry points. Start by reviewing the existing favorites GPX export and Nextcloud sharing behavior, then determine the scope of account-based and public-link sharing. Done would require an agreed design and a view-only way to access a shared favorites group.