refactor(cli): extract stage_spinner to shared progress module

Moves stage_spinner() from a private function in sync.rs to a pub function
in cli/progress.rs so it can be reused by the timeline and search commands.
The function creates a numbered spinner (e.g. [1/3]) for pipeline stages,
returning a hidden no-op bar in robot mode to keep caller code path-uniform.

sync.rs now imports from crate::cli::progress::stage_spinner instead of
defining its own copy. Adds unit tests for robot mode (hidden bar), human
mode (prefix/message properties), and prefix formatting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/commands/sync.rs

@@ -7,6 +7,7 @@ use tracing::Instrument;
 use tracing::{info, warn};
 
 use crate::Config;
+use crate::cli::progress::stage_spinner;
 use crate::core::error::Result;
 use crate::core::metrics::{MetricsLayer, StageTiming};
 use crate::core::shutdown::ShutdownSignal;
@@ -42,22 +43,6 @@ pub struct SyncResult {
     pub status_enrichment_errors: usize,
 }
 
-fn stage_spinner(stage: u8, total: u8, msg: &str, robot_mode: bool) -> ProgressBar {
-    if robot_mode {
-        return ProgressBar::hidden();
-    }
-    let pb = crate::cli::progress::multi().add(ProgressBar::new_spinner());
-    pb.set_style(
-        ProgressStyle::default_spinner()
-            .template("{spinner:.blue} {prefix} {msg}")
-            .expect("valid template"),
-    );
-    pb.enable_steady_tick(std::time::Duration::from_millis(80));
-    pb.set_prefix(format!("[{stage}/{total}]"));
-    pb.set_message(msg.to_string());
-    pb
-}
-
 pub async fn run_sync(
     config: &Config,
     options: SyncOptions,

src/cli/progress.rs

@@ -1,4 +1,4 @@
-use indicatif::MultiProgress;
+use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
 use std::io::Write;
 use std::sync::LazyLock;
 use tracing_subscriber::fmt::MakeWriter;
@@ -9,6 +9,26 @@ pub fn multi() -> &'static MultiProgress {
     &MULTI
 }
 
+/// Create a spinner for a numbered pipeline stage.
+///
+/// Returns a hidden (no-op) bar in robot mode so callers can use
+/// the same code path regardless of output mode.
+pub fn stage_spinner(stage: u8, total: u8, msg: &str, robot_mode: bool) -> ProgressBar {
+    if robot_mode {
+        return ProgressBar::hidden();
+    }
+    let pb = multi().add(ProgressBar::new_spinner());
+    pb.set_style(
+        ProgressStyle::default_spinner()
+            .template("{spinner:.blue} {prefix} {msg}")
+            .expect("valid template"),
+    );
+    pb.enable_steady_tick(std::time::Duration::from_millis(80));
+    pb.set_prefix(format!("[{stage}/{total}]"));
+    pb.set_message(msg.to_string());
+    pb
+}
+
 #[derive(Clone)]
 pub struct SuspendingWriter;
 
@@ -50,7 +70,6 @@ impl<'a> MakeWriter<'a> for SuspendingWriter {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use indicatif::ProgressBar;
 
     #[test]
     fn multi_returns_same_instance() {
@@ -88,4 +107,35 @@ mod tests {
         let w = MakeWriter::make_writer(&writer);
         drop(w);
     }
+
+    #[test]
+    fn stage_spinner_robot_mode_returns_hidden() {
+        let pb = stage_spinner(1, 3, "Testing...", true);
+        assert!(pb.is_hidden());
+    }
+
+    #[test]
+    fn stage_spinner_human_mode_sets_properties() {
+        // In non-TTY test environments, MultiProgress may report bars as
+        // hidden. Verify the human-mode code path by checking that prefix
+        // and message are configured (robot-mode returns a bare hidden bar).
+        let pb = stage_spinner(1, 3, "Testing...", false);
+        assert_eq!(pb.prefix(), "[1/3]");
+        assert_eq!(pb.message(), "Testing...");
+        pb.finish_and_clear();
+    }
+
+    #[test]
+    fn stage_spinner_sets_prefix_format() {
+        let pb = stage_spinner(2, 5, "Working...", false);
+        assert_eq!(pb.prefix(), "[2/5]");
+        pb.finish_and_clear();
+    }
+
+    #[test]
+    fn stage_spinner_sets_message() {
+        let pb = stage_spinner(1, 3, "Seeding timeline...", false);
+        assert_eq!(pb.message(), "Seeding timeline...");
+        pb.finish_and_clear();
+    }
 }