chore: clear background terminals on interrupt (#8786)

codex-rs/tui/src/chatwidget.rs

@@ -801,6 +801,8 @@ impl ChatWidget {
     fn on_interrupted_turn(&mut self, reason: TurnAbortReason) {
         // Finalize, log a gentle prompt, and clear running state.
         self.finalize_turn();
+        self.unified_exec_sessions.clear();
+        self.sync_unified_exec_footer();
 
         if reason != TurnAbortReason::ReviewEnded {
             self.add_to_history(history_cell::new_error_event(