feat: update model save (#3589)

Edit model save to save by default as global or on the profile depending
on the session

codex-rs/tui/src/app_event.rs

@@ -51,6 +51,12 @@ pub(crate) enum AppEvent {
     /// Update the current model slug in the running app and widget.
     UpdateModel(String),
 
+    /// Persist the selected model and reasoning effort to the appropriate config.
+    PersistModelSelection {
+        model: String,
+        effort: Option<ReasoningEffort>,
+    },
+
     /// Update the current approval policy in the running app and widget.
     UpdateAskForApprovalPolicy(AskForApproval),