The period romance “Sylvie’s Love” is set in the New York summer of 1957 and finds Tessa Thompson discovering a summer romance and a love of sultry, smooth jazz music, both courtesy of a fling with a man played by Nnamdi Asomugha.The first trailer for the film is elegant and colorful, but it also shows the challenges of Thompson’s own coming of age as a Black woman in the ’50s trying to sustain dreams at home and in her career.“I didn’t know that a Negro television producer even existed, and all