Run command UI (#1897)

Edit how commands show:

<img width="243" height="119" alt="image"
src="https://github.com/user-attachments/assets/13d5608e-3b66-4b8d-8fe7-ce464310d85d"
/>

codex-rs/tui/src/chatwidget.rs

@@ -485,7 +485,7 @@ impl ChatWidget<'_> {
             EventMsg::ExecCommandEnd(ExecCommandEndEvent {
                 call_id,
                 exit_code,
-                duration,
+                duration: _,
                 stdout,
                 stderr,
             }) => {
@@ -498,7 +498,6 @@ impl ChatWidget<'_> {
                         exit_code,
                         stdout,
                         stderr,
-                        duration,
                     },
                 ));
             }