fix command duration display (#1806)

we were always displaying "0ms" before.

<img width="731" height="101" alt="Screenshot 2025-08-02 at 10 51 22 PM"
src="https://github.com/user-attachments/assets/f56814ed-b9a4-4164-9e78-181c60ce19b7"
/>

codex-rs/tui/src/chatwidget.rs

@@ -1,7 +1,6 @@
 use std::collections::HashMap;
 use std::path::PathBuf;
 use std::sync::Arc;
-use std::time::Duration;
 
 use codex_core::codex_wrapper::CodexConversation;
 use codex_core::codex_wrapper::init_codex;
@@ -390,6 +389,7 @@ impl ChatWidget<'_> {
             EventMsg::ExecCommandEnd(ExecCommandEndEvent {
                 call_id,
                 exit_code,
+                duration,
                 stdout,
                 stderr,
             }) => {
@@ -400,7 +400,7 @@ impl ChatWidget<'_> {
                         exit_code,
                         stdout,
                         stderr,
-                        duration: Duration::from_secs(0),
+                        duration,
                     },
                 ));
             }