PALM HARBOR, Fla. — Shawn Stefani is the latest PGA Tour rookie to look comfortable on a big stage. It just took him a little longer to get there. In breezy conditions on a tough golf course, Stefani never came close to making a bogey until his final hole Thursday in the Tampa Bay Championship. He rolled in a par putt from just inside 5 feet to complete a 6-under 65 and take a two-shot lead over Brian Harman. “Kind of fought through a couple of bad shots coming in — or not so great shots — and managed to …