Update interruption error message styling (#3470)

<img width="497" height="76" alt="image"
src="https://github.com/user-attachments/assets/a1ad279d-1d01-41cd-ac14-b3343a392563"
/>

<img width="493" height="74" alt="image"
src="https://github.com/user-attachments/assets/baf487ba-430e-40fe-8944-2071ec052962"
/>

codex-rs/tui/src/history_cell.rs

@@ -1063,8 +1063,7 @@ pub(crate) fn new_error_event(message: String) -> PlainHistoryCell {
     // Use a hair space (U+200A) to create a subtle, near-invisible separation
     // before the text. VS16 is intentionally omitted to keep spacing tighter
     // in terminals like Ghostty.
-    let lines: Vec<Line<'static>> =
-        vec![vec![padded_emoji("🖐").red().bold(), " ".into(), message.into()].into()];
+    let lines: Vec<Line<'static>> = vec![vec![format!("■ {message}").red()].into()];
     PlainHistoryCell { lines }
 }