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/session_log.rs

@@ -141,7 +141,7 @@ pub(crate) fn log_inbound_app_event(event: &AppEvent) {
                 "ts": now_ts(),
                 "dir": "to_tui",
                 "kind": "insert_history_cell",
-                "lines": cell.transcript_lines().len(),
+                "lines": cell.transcript_lines(u16::MAX).len(),
             });
             LOGGER.write_json_line(value);
         }