Fix reasoning effort title (#4694)

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_selection_popup.snap

@@ -2,11 +2,11 @@
 source: tui/src/chatwidget/tests.rs
 expression: popup
 ---
-  Select Model
+  Select Model and Effort
   Switch the model for this and future Codex CLI sessions
 
 › 1. gpt-5-codex (current)  Optimized for coding tasks with many tools.
   2. gpt-5                  Broad world knowledge with strong general
                             reasoning.
 
-  Press enter to confirm or esc to go back
+  Press enter to select reasoning effort, or esc to dismiss.

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

@@ -1046,7 +1046,7 @@ fn reasoning_popup_escape_returns_to_model_popup() {
     chat.handle_key_event(KeyEvent::new(KeyCode::Esc, KeyModifiers::NONE));
 
     let after_escape = render_bottom_popup(&chat, 80);
-    assert!(after_escape.contains("Select Model"));
+    assert!(after_escape.contains("Select Model and Effort"));
     assert!(!after_escape.contains("Select Reasoning Level"));
 }