The New York State Court of Appeals has put the big chill on a woman's effort to be ruled the common-law wife of actor William Hurt. The court refused to consider the appeal of Sandra Jennings, 33, who has an 8-year-old son fathered by Hurt. Jennings, a former ballerina, based her claim on the fact that she and Hurt had lived together for several weeks in 1982 during the filming of the hit movie "The Big Chill" and had a 21/2-year relationship. Jennings was seeking a legal divorce that would entitle her to half of his estimated $10 million net worth. Hurt is now married to Heidi Henderson, daughter of bandleader Skitch Henderson, and they have a child.