tui: fix wrapping in trust_directory (#5007)

Refactor trust_directory to use ColumnRenderable & friends, thus
correcting wrapping behavior at small widths. Also introduce
RowRenderable with fixed-width rows.

- fixed wrapping in trust_directory
- changed selector cursor to match other list item selections
- allow y/n to work as well as 1/2
- fixed key_hint to be standard

before:
<img width="661" height="550" alt="Screenshot 2025-10-09 at 9 50 36 AM"
src="https://github.com/user-attachments/assets/e01627aa-bee4-4e25-8eca-5575c43f05bf"
/>

after:
<img width="661" height="550" alt="Screenshot 2025-10-09 at 9 51 31 AM"
src="https://github.com/user-attachments/assets/cb816cbd-7609-4c83-b62f-b4dba392d79a"
/>

codex-rs/tui/src/test_backend.rs

@@ -91,7 +91,8 @@ impl Backend for VT100Backend {
     }
 
     fn size(&self) -> io::Result<Size> {
-        Ok(self.vt100().screen().size().into())
+        let (rows, cols) = self.vt100().screen().size();
+        Ok(Size::new(cols, rows))
     }
 
     fn window_size(&mut self) -> io::Result<WindowSize> {