Imported photos (from importer or share extension) don't save reliably

[katagaki]

Sometimes it seems to take a short while to save.

This is happening after migrating refresh functions to async.

Share extension issue:

• Not confirmed but it appears that import isn't completely done when the share extension dismisses
• The next time it's opened, it may crash after about a second
• Perhaps share extension is actually leaking?
• Might need to bring back .save() call using actor
• Workaround: open share sheet extension again after completion and then immediately open main app

Importer issue

• Potentially just a data reload issue (same issue as when moving illustrations at the time of writing)