SAN FRANCISCO — Mere minutes after the final buzzer sounded, and with the score still showing on the big screen, an emotion-stirring graphic went up for all to see: side-by-side photos of Stephen Curry dribbling left-handed and Klay Thompson in nearly the same pose but now wearing a blue Mavericks jersey.The Golden State Warriors had just wrapped up their season-opening homestand and the game with Dallas was the next date at Chase Center — with all fans in attendance to receive a captain’s hat honoring Thompson’s tradition of boating to games as “Captain Klay.”On Tuesday night, Thompson returns to face the Warriors for the first time since joining the Mavericks in July on a three-year, $50 million contract following 11 seasons and four championships with Golden State.“I don’t think I’ll really know until I get there to be honest,” Thompson said when asked about he’d react to the reunion. “It’d be good to see all the people I grinded with that’s for sure, especially the training staff because we had some … we got to know each other very well over those rehab stints, very well.”The veteran guard missed more than 2 1/2 years — the entire 2019-20 and 2020-21 seasons — recovering from surgeries on his left knee and right Achilles tendon before making his comeback in January 2022. He has called the recoveries from consecutive injuries one of the hardest and most grueling things he has ever endured.The 34-year-old Thompson insists he will be able to focus as if it’s just another game on the schedule, even if that is hardly the case. He offered a farewell message to the Bay Area fans when he joined t …