Offline mode
As Siril freezes when an online request is made without a proper Web connection, and in some case it leads to computer crash (with GNOME), and with the object search searching first in annotations before falling back to the Internet, we don't really know what will happen. Adding an 'offline mode' in the settings would prevent the fallback and online operations in general (astrometry, photometry, solsys, search fallback, updates check, [complete the list]).