feat: close all threads in /new (#9478)

codex-rs/tui/src/app.rs

@@ -672,6 +672,9 @@ impl App {
                 let summary =
                     session_summary(self.chat_widget.token_usage(), self.chat_widget.thread_id());
                 self.shutdown_current_thread().await;
+                if let Err(err) = self.server.remove_and_close_all_threads().await {
+                    tracing::warn!(error = %err, "failed to close all threads");
+                }
                 let init = crate::chatwidget::ChatWidgetInit {
                     config: self.config.clone(),
                     frame_requester: tui.frame_requester(),