SANTA BARBARA — Plans to build luxury homes on a mesa overlooking the Bolsa Chica wetlands in Huntington Beach won approval Thursday from the California Coastal Commission, ending a 30-year battle that saved the salt marsh from development. Hearthside Homes will build 349 houses and a park on 105 acres overlooking the 1,100-acre Bolsa Chica Ecological Reserve, which is undergoing a $65-million restoration — the largest such undertaking in Southern California. The project — which has been reduced in size and scope over the years — represents what is expected to be the final skirmish over the wetlands after the...