Align user history message prefix width (#3467)

<img width="798" height="340" alt="image"
src="https://github.com/user-attachments/assets/fdd63f40-9c94-4e3a-bce5-2d2f333a384f"
/>

codex-rs/tui/src/status_indicator_widget.rs

@@ -17,6 +17,7 @@ use crate::app_event_sender::AppEventSender;
 use crate::key_hint;
 use crate::shimmer::shimmer_spans;
 use crate::tui::FrameRequester;
+use crate::ui_consts::LIVE_PREFIX_COLS;
 
 pub(crate) struct StatusIndicatorWidget {
     /// Animated header text (defaults to "Working").
@@ -159,7 +160,7 @@ impl WidgetRef for StatusIndicatorWidget {
         let pretty_elapsed = fmt_elapsed_compact(elapsed);
 
         // Plain rendering: no borders or padding so the live cell is visually indistinguishable from terminal scrollback.
-        let mut spans = vec![" ".into()];
+        let mut spans = vec![" ".repeat(LIVE_PREFIX_COLS as usize).into()];
         spans.extend(shimmer_spans(&self.header));
         spans.extend(vec![
             " ".into(),