Assuming intensity levels similar to the Carrington event?
At human scale, absolutely no biological effects.
At human household scale, no effect on metal objects, structures.
a LONG metal warehouse or metal ship will need to be earthed every several meters, to prevent increased rust rate due to galvanic action.
It only becomes a problem when you have LONG conductive structures that have very low electrical resistance AND are not earthed. Or electronics that are sensitive to very low voltage AND attached to significant lengths of conductors. For example a railroad's track will NOT be bothered, due to them being effectively earthed all the way, but a telegraph/telephone/power cable is affected because it is conductive and not earthed for very long distances.
Radio masts may be a problem, but then radio transmission as a whole will be iffy, and subject to very high noise levels.
Yes, anything relying on the planetary magnetic field will be useless. Bird navigation, magnetic compasses, etc. I would also be concerned for the radiation shielding ability of the planet's magnetosphere, permanent auroras will wipe out astronomy, etc.
Tesla would have loved this place. Free radiant electricity everywhere, just build half a transformer of large enough size and sit back.
There is absolutely NO impediment to electronics.
I believe the OP is conflating the effect of an EMP pulse with the much more diffuse effect of a geomagnetic disturbance. EMP is very short duration but, for those EMP events that concern us like those from a nuclear explosion, the effect are some twelve MAGNITUDES more intense.
For reference: At its peak, the Carrington Event imposed an electric field of some 4 volt per kilometer.
Yes, ONLY 4 volt per km of unshielded, unearthed, continuous wire length.