SAN FRANCISCO – Gui Santos’ emergence this season has been one of the best stories of the Warriors and the entire NBA. All the work Santos has put in since being selected by Golden State in the second round of the 2022 NBA Draft was rewarded Saturday by the Warriors with a multi-year contract extension. While the Warriors didn’t announce details of the deal, ESPN’s Shams Charania reported, citing sources, that Santos signed a three-year, $15 million contract with a player option for the 2028-29 NBA season. “Happy for Gui, and happy for us,” Warriors coach Steve Kerr said Saturday during his pregame press conference. “He’s been such an important player for us, but also just an incredible development story. Second-round pick and spent his entire first year in Santa Cruz. … He’s become one of our most important players. We’re all so thrilled for him. He’s excited, it’s a great day.”First on Santos’ list was calling his parents to tell them the great news. But he had to make them sweat at least a little bit.Disguising his tone the best he could, Santos told his parents he had...