Kairos 2.2.2

A safety fix for notes. Everyone on 2.2.0 or 2.2.1 should update.

Fixed

Notes are never deleted because the vault folder looks empty. If the vault folder was missing, unreadable, empty, or pointed somewhere new, Kairos could treat every note that came from the vault as deleted and remove it from the app. Now a note is only removed when Kairos actually read its vault file, the file had content, and it came from that same vault. Otherwise the note stays and is marked as not synced, so nothing disappears.