Move approvals to use ListSelectionView (#4275)

Unify selection menus:
- Move approvals to the vertical menu `ListSelectionView`
- Add header section to `ListSelectionView`

<img width="502" height="214" alt="image"
src="https://github.com/user-attachments/assets/f4b43ddf-3549-403c-ad9e-a523688714e4"
/>

<img width="748" height="214" alt="image"
src="https://github.com/user-attachments/assets/f94ac7b5-dc94-4dc0-a1df-7a8e3ba2453b"
/>

---------

Co-authored-by: pakrym-oai <pakrym@openai.com>

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

@@ -1,4 +1,4 @@
-use crate::user_approval_widget::ApprovalRequest;
+use crate::bottom_pane::ApprovalRequest;
 use crossterm::event::KeyEvent;
 use ratatui::buffer::Buffer;
 use ratatui::layout::Rect;