MichA le Morgan, a French movie actress who starred in the moody masterpiece “Port of Shadows” and who, during a brief Hollywood sojourn, helped introduce Frank Sinatra to film audiences in his first big role, died Dec. 20. She was 96. In a career spanning seven decades, Ms. Morgan was best known as the ethereal femme fatale in “Port of Shadows” , a film at the core of the poetic realism movement in French cinema.