Updated

src/lib/formatTime.ts

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+/**
+ * Formats milliseconds into a readable time string with full precision and rounded version.
+ * @param ms - Time in milliseconds
+ * @returns Formatted string like "01:23:45 (1h 24m)" or "00:05:23 (5m)"
+ */
+export function formatDuration(ms: number): string {
+  const totalSeconds = Math.floor(ms / 1000);
+  const hours = Math.floor(totalSeconds / 3600);
+  const minutes = Math.floor((totalSeconds % 3600) / 60);
+  const seconds = totalSeconds % 60;
+  
+  const timeStr = `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
+  
+  // Calculate rounded version for easy reading
+  const totalMinutes = Math.round(ms / 1000 / 60);
+  const roundedHours = Math.floor(totalMinutes / 60);
+  const roundedMinutes = totalMinutes % 60;
+  
+  let roundedStr = '';
+  if (roundedHours > 0) {
+    roundedStr = roundedMinutes > 0 ? `${roundedHours}h ${roundedMinutes}m` : `${roundedHours}h`;
+  } else {
+    roundedStr = `${roundedMinutes}m`;
+  }
+  
+  return `${timeStr} (${roundedStr})`;
+}
+
+/**
+ * Formats a time range between two dates.
+ * @param start - Start date
+ * @param end - End date (null if still running)
+ * @returns Formatted duration string or "Running..."
+ */
+export function formatTimeRange(start: Date, end: Date | null): string {
+  if (!end) return 'Running...';
+  const ms = end.getTime() - start.getTime();
+  return formatDuration(ms);
+}