By Stefano Rebaudo (Reuters) -The U.S. dollar headed for a third straight daily loss against the euro while edging up versus the yen on Thursday, as concerns over U.S.-China tensions and dovish remarks from Federal Reserve officials continued to weigh on sentiment. Analysts say political headwinds have weighed on the yen but expect support to come from looming Fed rate cuts, the end of U.S. quantitative tightening, and a potential rise in market volatility, which usually supports safe-haven assets. The ...