Stinson Beach neighbors have asked the California Coastal Commission to block a home proposed for the last remaining shorefront lot in Stinson Beach—an area impacted by floods and sea-level rise. Marin supervisors approved the project on Nov. 7 after the Planning Commission required the property owners to reduce the size of the home from 1,500 square feet to 1,300 square feet, eliminate a planned garage and restore a portion of a sand dune on the…