For Chinese Americans, the news this week might have seemed disorienting. There was the largely make-nice tone of the summit in Beijing between President Trump and the Chinese leader, Xi Jinping, which ended on Friday. But in the days leading up to the summit, two criminal cases in the United States reflected how the countries’ competitive and often tense geopolitical relationship has made life more difficult for many people of Chinese origin living in the United States. On Monday, federal prosecutors announced that Eileen Wang, the mayor of Arcadia, a…