tui: route tui through app-server notifications

codex-rs/cli/src/main.rs

@@ -533,10 +533,7 @@ fn format_exit_messages(exit_info: AppExitInfo, color_enabled: bool) -> Vec<Stri
 
     let mut lines = Vec::new();
     if !token_usage.is_zero() {
-        lines.push(format!(
-            "{}",
-            codex_protocol::protocol::FinalOutput::from(token_usage)
-        ));
+        lines.push(token_usage.to_string());
     }
 
     if let Some(resume_cmd) =
@@ -1688,7 +1685,7 @@ mod tests {
     use super::*;
     use assert_matches::assert_matches;
     use codex_protocol::ThreadId;
-    use codex_protocol::protocol::TokenUsage;
+    use codex_tui::TokenUsage;
     use pretty_assertions::assert_eq;
 
     fn finalize_resume_from_args(args: &[&str]) -> TuiCli {