Wells Fargo & Co., the nation’s biggest mortgage lender, said Friday that first-quarter profit surged 23 percent after it cut expenses. The bank’s expenses fell nearly 5 percent, helped by lower borrowing costs and a wrongful foreclosure settlement that ended fees to consultants. The lower costs offset a slight decline in revenue as mortgage lending slowed. Net income rose to $4.93 billion from $4.02 billion a year earlier. The 92 cents per share beat the 89 cents forecast.