feat: add elapsed ms in debugs

src/utils/duration.ts

@@ -0,0 +1,15 @@
+/**
+ * Format a millisecond duration as a human-readable string.
+ *  - < 1s:    "450ms"
+ *  - < 60s:   "1.23s"
+ *  - >= 60s:  "2m 5s"
+ */
+export function formatDuration(ms: number): string {
+  if (ms < 0 || !Number.isFinite(ms)) return "0ms";
+  if (ms < 1000) return `${Math.round(ms)}ms`;
+  const seconds = ms / 1000;
+  if (seconds < 60) return `${seconds.toFixed(2)}s`;
+  const minutes = Math.floor(seconds / 60);
+  const remainingSeconds = Math.floor(seconds % 60);
+  return `${minutes}m ${remainingSeconds}s`;
+}