Function calculateTrend

src/utils/git-dates.ts:93–104

(
  newestDate: Date | undefined
)

 * @returns Trend classification
 */
export function calculateTrend(
  newestDate: Date | undefined
): 'Rising' | 'Declining' | 'Stable' | undefined {
  if (!newestDate) return undefined;

  const now = new Date();
  const daysDiff = Math.floor((now.getTime() - newestDate.getTime()) / (1000 * 60 * 60 * 24));

  if (daysDiff <= 60) return 'Rising';
  if (daysDiff >= 180) return 'Declining';
  return 'Stable';
}