RUSSIAN republic leader Boris Yeltsin was more seriously injured than first reported in a traffic accident a week ago, and the charismatic populist has been confined to bed for 10 days, a Soviet reported Saturday . . . GAYLE ROSTEN, daughter of U.S. Rep. Daniel Rostenkowski, has pleaded guilty to a cocaine possession charge in Lake County, Ill. Rosten, 37, will reportedly serve a prison term.