You have wrist pain while typing... but not while deadlifting?? Hmm... Well... when deadlifting your wrists are typically in line with your forearm and are not bending up or down to form an angle with the lower arm. I know when i type they are bent slightly but not much. When benching, some people don't keep the barbell in line over their wrist in the palms of their hands and instead let it roll back into the hand. This will make the wrist support a lot of the weight of the barbell and can put a terrible strain on the wrist; plus, while benching, you have to exert energy to keep the weight from rolling off ur hands onto your chest as well as lowering and then pushing it. My guess is that you are holding it like this when you bench and strained some tendons in the wrist and hand... which would be aggrevated by typing.
I'd say lay off benching for a few days and see how it feels.