Migrate codex max (#7566)

- make codex max the default
- fix: we were doing some async work in sync function which caused tui
to panic

codex-rs/tui/src/chatwidget.rs

@@ -2031,7 +2031,7 @@ impl ChatWidget {
     }
 
     fn lower_cost_preset(&self) -> Option<ModelPreset> {
-        let models = self.models_manager.available_models.blocking_read();
+        let models = self.models_manager.available_models.try_read().ok()?;
         models
             .iter()
             .find(|preset| preset.model == NUDGE_MODEL_SLUG)
@@ -2138,13 +2138,17 @@ impl ChatWidget {
     /// a second popup is shown to choose the reasoning effort.
     pub(crate) fn open_model_popup(&mut self) {
         let current_model = self.config.model.clone();
-        let presets: Vec<ModelPreset> = self
-            .models_manager
-            .available_models
-            .blocking_read()
-            .iter()
-            .cloned()
-            .collect();
+        let presets: Vec<ModelPreset> =
+            // todo(aibrahim): make this async function
+            if let Ok(models) = self.models_manager.available_models.try_read() {
+                models.clone()
+            } else {
+                self.add_info_message(
+                    "Models are being updated; please try /model again in a moment.".to_string(),
+                    None,
+                );
+                return;
+            };
 
         let mut items: Vec<SelectionItem> = Vec::new();
         for preset in presets.into_iter() {