[Feature]: "Add to Library"

Feature detail

It'd be nice to have an "Add to Library" option for photos that others have shared with you. This could be done on a per-photo or per-album basis.

This way, if someone shares a photo with me via Immich shared album, it's easy for me to set that photo to be viewable from my main photo's tab (what I'm calling a "Library" for the sake of this request) without needing to download it and re-upload it to my own user's Immich library. Sometimes a user might want any new photo added to a shared album to be included in their library, and sometimes a user might just want to pick a particular photo out of a shared album to include in their library.

Even if the original owner deletes the photo on their account, it should remain accessible to other users who have saved that photo to their library.

Platform

Server