bug: fix model save (#3525)

Fix those 2 behaviors:
1. The model does not get saved if we don't CTRL + S
2. The reasoning effort get saved

codex-rs/tui/src/chatwidget/tests.rs

@@ -247,6 +247,17 @@ fn make_chatwidget_manual() -> (
     (widget, rx, op_rx)
 }
 
+pub(crate) fn make_chatwidget_manual_with_sender() -> (
+    ChatWidget,
+    AppEventSender,
+    tokio::sync::mpsc::UnboundedReceiver<AppEvent>,
+    tokio::sync::mpsc::UnboundedReceiver<Op>,
+) {
+    let (widget, rx, op_rx) = make_chatwidget_manual();
+    let app_event_tx = widget.app_event_tx.clone();
+    (widget, app_event_tx, rx, op_rx)
+}
+
 fn drain_insert_history(
     rx: &mut tokio::sync::mpsc::UnboundedReceiver<AppEvent>,
 ) -> Vec<Vec<ratatui::text::Line<'static>>> {