By Howard Schneider and Lindsay Dunsmuir (Reuters) -The financial strength built up in U.S. households limited the damage from the coronavirus pandemic but may now be aggravating – and prolonging – the Federal Reserve’s inflation fight as the central bank waits for people to run out of spending power. The recent dive in stock market prices – a source of household wealth that has broadened its influence across income levels in recent years – may help soften consumption eventually, but reports this week on household debt, financial conditions and inflation gave little sense consumers are close t…