Rebounding from a dismal start to the year, the U.S. economy added 223,000 jobs in April, a solid gain that suggested that employers are helping fuel a durable if still subpar recovery. The job growth helped lower the unemployment rate to 5.4 percent from 5.5 percent in March, the Labor Department said Friday. That is the lowest rate since May 2008, six months into the Great Recession. The figures provided some reassurance that the economy is recovering from a harsh winter and other temporary headwinds that likely caused it to shrink in the first three months of the year. Yet...