Better sharing in Immich (feature freeze)

Better sharing in Immich (feature freeze): Sharing precious photos and videos is an important part of immich, but right now it is a bit confusing and limiting. There are some technical implications to sharing decisions, especially as it relates to security and access controls. Lately there have been a lot of PRs tweaking queries here and there, but really this deserves a proper face lift by the development team. For now, we are going to put a feature freeze on any sharing related changes while we internally discuss and come up with a plan for what sharing in immich will...