feat: /review (#3774)

Adds `/review` action in TUI

<img width="637" height="370" alt="Screenshot 2025-09-17 at 12 41 19 AM"
src="https://github.com/user-attachments/assets/b1979a6e-844a-4b97-ab20-107c185aec1d"
/>

codex-rs/tui/src/history_cell.rs

@@ -236,6 +236,13 @@ impl HistoryCell for TranscriptOnlyHistoryCell {
     }
 }
 
+/// Cyan history cell line showing the current review status.
+pub(crate) fn new_review_status_line(message: String) -> PlainHistoryCell {
+    PlainHistoryCell {
+        lines: vec![Line::from(message.cyan())],
+    }
+}
+
 #[derive(Debug)]
 pub(crate) struct PatchHistoryCell {
     event_type: PatchEventType,