Shopping at the Palace Market might feel a bit different after Friday, when grocer Sajjapan “Sam” Ratchakamin will leave a role in which he has remained a social icon for the past eight years. His next move: Running his new restaurant, called Thai Garden, in Sacramento. Sam’s departure has led many regular shoppers and co-workers, including store manager Clint Dent, to reflect on the approachable manner of a man whom some have grown to recognize…