When historical American homes are in need of preservation and an exquisitely traditional makeover, their homeowners have turned to interior designer Cathy Kincaid for over 40 years. She’s played fairy godmother to dozens of charming houses that are full of character, including a 1750s Connecticut ferryman’s cottage on the water, Manhattan penthouses, and a forested East Texas estate. “I think it’s so important to live in something that has history,” Kincaid said. “I think it inspires us … to be interested in the history of the United States, where we live, our cities. And these older homes, they do have a story to tell.”…