By Herbert Lash NEW YORK (Reuters) -American and European equity markets wobbled and U.S. Treasury yields fell on Monday after unexpectedly weak economic data from China and a big slide in New York state’s factory activity painted a bleak picture for economic growth across the world. Chinese retail and factory activity fell sharply in April as COVID-19 lockdowns severely disrupted supply chains while New York factory output slumped in May for the third time this year amid a collapse in new orders and shipments. The Chinese data cast a long shadow over the outlook for the world’s second-largest…