[feat] Simplfy command approval UI (#2708)

- Removed the plain "No" option, which confused the model,
  since we already have the "No, provide feedback" option,
  which works better.

# Before

<img width="476" height="168" alt="image"
src="https://github.com/user-attachments/assets/6e783d9f-dec9-4610-9cad-8442eb377a90"
/>

# After

<img width="553" height="175" alt="image"
src="https://github.com/user-attachments/assets/3cdae582-3366-47bc-9753-288930df2324"
/>

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

@@ -530,7 +530,7 @@ mod tests {
         // Push an approval modal (e.g., command approval) which should hide the status view.
         pane.push_approval_request(exec_request());
 
-        // Simulate pressing 'n' (deny) on the modal.
+        // Simulate pressing 'n' (No) on the modal.
         use crossterm::event::KeyCode;
         use crossterm::event::KeyEvent;
         use crossterm::event::KeyModifiers;