feat: model picker (#8209)

# External (non-OpenAI) Pull Request Requirements

Before opening this Pull Request, please read the dedicated
"Contributing" markdown file or your PR may be closed:
https://github.com/openai/codex/blob/main/docs/contributing.md

If your PR conforms to our contribution guidelines, replace this text
with a detailed and high quality description of your changes.

Include a link to a bug report or enhancement request.

codex-rs/tui2/src/chatwidget.rs

@@ -2100,7 +2100,7 @@ impl ChatWidget {
     }
 
     fn lower_cost_preset(&self) -> Option<ModelPreset> {
-        let models = self.models_manager.try_list_models().ok()?;
+        let models = self.models_manager.try_list_models(&self.config).ok()?;
         models
             .iter()
             .find(|preset| preset.model == NUDGE_MODEL_SLUG)
@@ -2209,7 +2209,7 @@ impl ChatWidget {
         let current_model = self.model_family.get_model_slug().to_string();
         let presets: Vec<ModelPreset> =
             // todo(aibrahim): make this async function
-            match self.models_manager.try_list_models() {
+            match self.models_manager.try_list_models(&self.config) {
                 Ok(models) => models,
                 Err(_) => {
                     self.add_info_message(

codex-rs/tui2/src/chatwidget/tests.rs

@@ -925,7 +925,7 @@ fn active_blob(chat: &ChatWidget) -> String {
 fn get_available_model(chat: &ChatWidget, model: &str) -> ModelPreset {
     let models = chat
         .models_manager
-        .try_list_models()
+        .try_list_models(&chat.config)
         .expect("models lock available");
     models
         .iter()
@@ -1906,6 +1906,7 @@ fn single_reasoning_option_skips_selection() {
         is_default: false,
         upgrade: None,
         show_in_picker: true,
+        supported_in_api: true,
     };
     chat.open_reasoning_popup(preset);