rework patch/exec approval UI (#4573)

| Scenario | Screenshot |
| ---------------------- |
----------------------------------------------------------------------------------------------------------------------------------------------------
|
| short patch | <img width="1096" height="533" alt="short patch"
src="https://github.com/user-attachments/assets/8a883429-0965-4c0b-9002-217b3759b557"
/> |
| short command | <img width="1096" height="533" alt="short command"
src="https://github.com/user-attachments/assets/901abde8-2494-4e86-b98a-7cabaf87ca9c"
/> |
| long patch | <img width="1129" height="892" alt="long patch"
src="https://github.com/user-attachments/assets/fa799a29-a0d6-48e6-b2ef-10302a7916d3"
/> |
| long command | <img width="1096" height="892" alt="long command"
src="https://github.com/user-attachments/assets/11ddf79b-98cb-4b60-ac22-49dfa7779343"
/> |
| viewing complete patch | <img width="1129" height="892" alt="viewing
complete patch"
src="https://github.com/user-attachments/assets/81666958-af94-420e-aa66-b60d0a42b9db"
/> |

codex-rs/tui/src/status_indicator_widget.rs

@@ -17,7 +17,6 @@ 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").
@@ -160,7 +159,7 @@ 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![" ".repeat(LIVE_PREFIX_COLS as usize).into()];
+        let mut spans = vec!["  ".into()];
         spans.extend(shimmer_spans(&self.header));
         spans.extend(vec![
             " ".into(),