tui: bring the transcript closer to display mode (#4848)

before
<img width="1161" height="836" alt="Screenshot 2025-10-06 at 3 06 52 PM"
src="https://github.com/user-attachments/assets/7622fd6b-9d37-402f-8651-61c2c55dcbc6"
/>

after
<img width="1161" height="858" alt="Screenshot 2025-10-06 at 3 07 02 PM"
src="https://github.com/user-attachments/assets/1498f327-1d1a-4630-951f-7ca371ab0139"
/>

codex-rs/tui/src/diff_render.rs

@@ -67,7 +67,7 @@ impl From<DiffSummary> for Box<dyn Renderable> {
             rows.push(Box::new(path));
             rows.push(Box::new(RtLine::from("")));
             rows.push(Box::new(InsetRenderable::new(
-                Box::new(row.change),
+                row.change,
                 Insets::tlbr(0, 2, 0, 0),
             )));
         }