SAN JOSE—Former finance minister Rodrigo Chaves clinched Costa Rica’s presidency on Sunday. Chaves, a veteran former official of the World Bank, was projected to win about 52.9 percent of the vote in the run-off ballot, a preliminary tally by the electoral tribunal showed, based on returns from some 97 percent of polling stations. Rival candidate and former Costa Rican president Jose Maria Figueres was forecast to secure about 47.1 percent. Turnout was 57.3 percent, the electoral tribunal said, less than the 60 percent who cast ballots in the first round. Going into Sunday’s vote, some voters said they were lukewarm on both candidates, whose political careers have been tainted by accusations of wrongdoing. Chaves faced accusations of sexual harassment during his World Bank tenure, which he denied. Figueres resigned as executive director of the World Economic Forum in 2004 amid accusations that he had influenced state contracts with Alcatel, a …