refactor(progress): extract format_stage_line with themed styling

Pull the line-formatting logic out of finish_stage() into a standalone
public format_stage_line() so that sync.rs can build stage lines without
needing a live ProgressBar (e.g. for static multi-line blocks printed
after the spinner is cleared).

The new function applies Theme::info().bold() to the label and
Theme::timing() to the elapsed column, giving every stage line
consistent color treatment. finish_stage() now delegates to it.

Includes a unit test asserting the formatted output contains the
expected icon, label, summary, and elapsed components.

src/cli/progress.rs

@@ -4,7 +4,7 @@ use std::sync::LazyLock;
 use std::time::Duration;
 use tracing_subscriber::fmt::MakeWriter;
 
-use crate::cli::render::Icons;
+use crate::cli::render::{Icons, Theme};
 
 static MULTI: LazyLock<MultiProgress> = LazyLock::new(MultiProgress::new);
 
@@ -56,12 +56,21 @@ pub fn nested_progress(msg: &str, len: u64, robot_mode: bool) -> ProgressBar {
 ///
 /// Output: `  ✓ Label  summary  elapsed`
 pub fn finish_stage(pb: &ProgressBar, icon: &str, label: &str, summary: &str, elapsed: Duration) {
-    let elapsed_str = format_elapsed(elapsed);
+    let line = format_stage_line(icon, label, summary, elapsed);
-    let line = format!("  {icon} {label:<12}{summary:>40}  {elapsed_str:>8}",);
     pb.set_style(ProgressStyle::with_template("{msg}").expect("valid template"));
     pb.finish_with_message(line);
 }
 
+/// Build a static stage line showing icon, label, summary, and elapsed.
+///
+/// Output: `  ✓ Label  summary  elapsed`
+pub fn format_stage_line(icon: &str, label: &str, summary: &str, elapsed: Duration) -> String {
+    let elapsed_str = format_elapsed(elapsed);
+    let styled_label = Theme::info().bold().render(&format!("{label:<12}"));
+    let styled_elapsed = Theme::timing().render(&format!("{elapsed_str:>8}"));
+    format!("  {icon} {styled_label}{summary:>40}  {styled_elapsed}")
+}
+
 /// Format a Duration as a compact human string (e.g. "1.2s", "42ms", "1m 5s").
 fn format_elapsed(d: Duration) -> String {
     let ms = d.as_millis();
@@ -203,4 +212,13 @@ mod tests {
         assert_eq!(format_elapsed(Duration::from_secs(65)), "1m 5s");
         assert_eq!(format_elapsed(Duration::from_secs(120)), "2m 0s");
     }
+
+    #[test]
+    fn format_stage_line_includes_label_summary_and_elapsed() {
+        let line = format_stage_line("✔", "Issues", "10 issues", Duration::from_millis(4200));
+        assert!(line.contains("✔"));
+        assert!(line.contains("Issues"));
+        assert!(line.contains("10 issues"));
+        assert!(line.contains("4.2s"));
+    }
 }