fix wrap behavior for long commands (#7655)

before:
<img width="720" height="225" alt="image"
src="https://github.com/user-attachments/assets/19b7ad7c-db14-4792-97cc-80677a3a52ec"
/>
after:
<img width="500" height="219" alt="Screenshot 2025-12-05 at 4 37 14 PM"
src="https://github.com/user-attachments/assets/f877f846-5943-4ca7-8949-89e8524ffdb9"
/>


also removes `is_current`, which is deadcode

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

@@ -182,9 +182,9 @@ impl CommandPopup {
                 GenericDisplayRow {
                     name,
                     match_indices: indices.map(|v| v.into_iter().map(|i| i + 1).collect()),
-                    is_current: false,
                     display_shortcut: None,
                     description: Some(description),
+                    wrap_indent: None,
                 }
             })
             .collect()