Deduplicate duration and number formatting internals

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RaRBJFZKSTA7naHGuQHfnQ

src/module/abbreviateNumber.js

@@ -6,6 +6,8 @@
 //   cindy.chang@dsp.im (Cindy Chang), 2024/5/30
 /** @module abbreviateNumber Duration abbreviation formatting. */
 
+import formatDuration from "./formatDuration.js";
+
 /**
  * Converts a total number of seconds into a human-readable abbreviated
  * duration string using days, hours, minutes, and seconds.
@@ -15,27 +17,7 @@
  *   or "0" if totalSeconds is zero.
  */
 export default function abbreviateNumber(totalSeconds) {
-  let seconds = 0;
-  let minutes = 0;
-  let hours = 0;
-  let days = 0;
-  let result = "";
-  let symbols = ["d", "h", "m", "s"];
-
-  totalSeconds = Number.parseInt(totalSeconds);
-  if (!Number.isNaN(totalSeconds)) {
-    seconds = totalSeconds % 60;
-    minutes = (Math.floor(totalSeconds - seconds) / 60) % 60;
-    hours = Math.floor(totalSeconds / 3600) % 24;
-    days = Math.floor(totalSeconds / (3600 * 24));
-  }
-
-  const units = [days, hours, minutes, seconds];
-  for (let i = 0; i < units.length; i++) {
-    if (units[i] > 0) result += units[i] + symbols[i] + " ";
-  }
-  result = result.trim();
-  if (totalSeconds === 0) result = "0";
-
-  return result;
+  const parsed = Number.parseInt(totalSeconds);
+  if (parsed === 0) return "0";
+  return formatDuration(parsed, { separator: " " });
 }