One of the stars in the latest production of Seattle Children’s Theatre is the perfect example of how theater can be something magical. The performer’s name is “Trueheart.” She has a carved head, a sweet personality and by the show’s end, everyone wants to nuzzle her. Trueheart is one of the title characters in the current production, “Dick Whittington and His Cat.” And he’s a scrawny but amiable creation of puppet master Annett Mateo.