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"
/>

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

codex-rs/tui/src/lib.rs

@@ -66,7 +66,6 @@ mod streaming;
 mod text_formatting;
 mod tui;
 mod ui_consts;
-mod user_approval_widget;
 mod version;
 mod wrapping;