Send message by default mid turn. queue messages by tab (#9077)

https://github.com/user-attachments/assets/03838730-4ddc-44df-a2c7-cb8ecda78660

codex-rs/tui/src/bottom_pane/mod.rs

@@ -145,6 +145,10 @@ impl BottomPane {
         self.request_redraw();
     }
 
+    pub fn set_steer_enabled(&mut self, enabled: bool) {
+        self.composer.set_steer_enabled(enabled);
+    }
+
     pub fn status_widget(&self) -> Option<&StatusIndicatorWidget> {
         self.status.as_ref()
     }