With one justice dissenting on the answer to a subtle jurisdictional question about the 30-day deadline for requesting sanctions under Illinois Supreme Court Rule 137 — in a case where (1) a counterclaim remained pending after the trial judge issued a Rule 304(a) finding that made a final judgment on all of the plaintiff’s claims immediately appealable, and (2) the motion for sanctions that the defendants submitted four months later didn’t allege any misconduct in how the plaintiff responded to the …