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/render/mod.rs

@@ -6,10 +6,10 @@ pub mod renderable;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub struct Insets {
-    pub left: u16,
-    pub top: u16,
-    pub right: u16,
-    pub bottom: u16,
+    left: u16,
+    top: u16,
+    right: u16,
+    bottom: u16,
 }
 
 impl Insets {