Under a deal announced Monday by several voting-rights groups, the state will send voter registration cards to nearly 3.8 million Californians who have applied for health insurance under the Affordable Care Act. The move will ensure that many residents can complete or update their registration in time for the June 3 primary election, representatives of the groups said, and bring the state into compliance with the National Voter Registration Act of 1993. The law requires that certain state offices provide clients with registration opportunities.