HONG KONG : The protests that swept through Chinese cities over the weekend were mainly about unhappiness over Beijing’s strict Covid-control measures. But they also reflected another source of tension Beijing is nervous about: growing economic frustration among China’s younger generation. The rare public displays of discontent, which included protests on university campuses, came as authorities have struggled to put a floor under the economy, which is on track to expand at the slowest pace in more than four decades this year, apart from 2020, the year when Covid first hit. The outlook is particularly gloomy for young Chinese. The…