No idea on the ride height difference--you sure the ground is level when youre measuring?
But I'm guessing with the wheel off center something got moved when they did either the steering shaft replacement or the airbag. Take it back and have them recenter the steering. That's my big pet peeve when taking a car in for alignment--they forget to center the steering and lock the wheel when adjusting the toe in, and while the car is aligned properly the steering wheel is off center...so I have to drive it back and get them to readjust it.
But I'm guessing with the wheel off center something got moved when they did either the steering shaft replacement or the airbag. Take it back and have them recenter the steering. That's my big pet peeve when taking a car in for alignment--they forget to center the steering and lock the wheel when adjusting the toe in, and while the car is aligned properly the steering wheel is off center...so I have to drive it back and get them to readjust it.