Match agent status symbols to the selected row style (#47319)

## Why

Status symbols in the agents overview retained their status color when selected, making their styling inconsistent with the rest of the selected row.

## What changed

Apply the row's selection style to its status symbol while preserving status colors for unselected rows.

## Testing

Extend rendering tests to assert and snapshot selected status symbol styles across status variants, and verify that an unselected idle symbol retains its cyan color.

GitOrigin-RevId: a5163841bed80d6d43e7c62a7596c6e48b9dc886

codex-rs/tui/src/app/agent_center/rows.rs

@@ -153,7 +153,10 @@ impl AgentsOverviewView {
                 },
                 style,
             );
-            let (status, dot) = Self::status(task);
+            let (status, mut dot) = Self::status(task);
+            if index == self.selected {
+                dot.style = style;
+            }
             line(
                 Line::from(if index == self.selected { "›" } else { " " }).style(style),
                 rect,

codex-rs/tui/src/app/agent_center_tests.rs

@@ -66,8 +66,39 @@ async fn live_center_columns() {
             thread
         })
         .collect::<Vec<_>>();
-    let view = app.agents_overview_view(threads, Some(current));
+    let mut view = app.agents_overview_view(threads, Some(current));
     insta::assert_snapshot!(screen(&view, /*width*/ 160, /*height*/ 22));
+    let mut selected_status_styles = Vec::new();
+    for _ in 0..fixtures.len() {
+        let area = Rect::new(
+            /*x*/ 0, /*y*/ 0, /*width*/ 160, /*height*/ 22,
+        );
+        let mut buf = ratatui::buffer::Buffer::empty(area);
+        view.render(area, &mut buf);
+        let selected_row = buf
+            .content
+            .chunks(usize::from(area.width))
+            .find(|row| row.iter().any(|cell| cell.symbol() == "›"))
+            .unwrap();
+        let marker = selected_row
+            .iter()
+            .position(|cell| cell.symbol() == "›")
+            .unwrap();
+        assert_eq!(
+            selected_row[marker + 2].style(),
+            selected_row[marker].style()
+        );
+        selected_status_styles.push(format!(
+            "{} | {:?}",
+            selected_row[marker + 2].symbol(),
+            selected_row[marker + 2].style()
+        ));
+        view.handle_key_event(KeyCode::Down.into());
+    }
+    insta::assert_snapshot!(
+        "live_center_selected_status_styles",
+        selected_status_styles.join("\n")
+    );
 }
 
 #[tokio::test]

codex-rs/tui/src/app/agents_overview_tests.rs

@@ -61,6 +61,10 @@ async fn overview_thread_colors_match_footer_and_respect_color_suppression() {
             let text: String = row.iter().map(ratatui::buffer::Cell::symbol).collect();
             if let Some(x) = text.find("Named task") {
                 let x = text[..x].chars().count();
+                let dot = row.iter().find(|cell| cell.symbol() == "○").unwrap();
+                let mut expected = ratatui::buffer::Cell::default();
+                expected.set_symbol("○").set_style(Style::default().cyan());
+                assert_eq!(dot, &expected);
                 snapshot.push(format!(
                     "{} | title style: {:?}",
                     normalize_agent_center_snapshot(&text),
@@ -147,6 +151,7 @@ use pretty_assertions::assert_eq;
 use ratatui::Terminal;
 use ratatui::backend::TestBackend;
 use ratatui::layout::Rect;
+use ratatui::style::Style;
 
 static OVERVIEW_TIMESTAMP: std::sync::LazyLock<i64> =
     std::sync::LazyLock::new(|| chrono::Utc::now().timestamp() - 120);

codex-rs/tui/src/app/snapshots/codex_tui__app__agents_overview__tests__command_center__live_center_selected_status_styles.snap

@@ -0,0 +1,11 @@
+---
+source: tui/src/app/agent_center_tests.rs
+assertion_line: 98
+expression: "selected_status_styles.join(\"\\n\")"
+---
+○ | Style::new().fg(Color::Reset).bg(Color::Reset).underline_color(Color::Reset).bold().reversed()
+○ | Style::new().fg(Color::Reset).bg(Color::Reset).underline_color(Color::Reset).bold().reversed()
+! | Style::new().fg(Color::Reset).bg(Color::Reset).underline_color(Color::Reset).bold().reversed()
+● | Style::new().fg(Color::Reset).bg(Color::Reset).underline_color(Color::Reset).bold().reversed()
+● | Style::new().fg(Color::Reset).bg(Color::Reset).underline_color(Color::Reset).bold().reversed()
+○ | Style::new().fg(Color::Reset).bg(Color::Reset).underline_color(Color::Reset).bold().reversed()