I've been reading about magnetism from the point of view of reference frames and relativity.
The concept of a test charge moving next to a wire (and how the choice of reference frame will cause Lorentz contractions of the charges in the wire, resulting in an electric force in the test charge's frame makes perfect sense to me. It explains how what we interpret as a "magnetic field" is really a consequence of combining electrostatics with relativity.
But I haven't been able to find a good explanation of permanent magnets from this point of view. How would someone (and could they) explain these permanent fields using relativity?
Apologies if my question isn't airtight in terms of terminology, just a curious layman. Thank you!