enhancement

src/features/store-admin/dispatchModel.ts

@@ -421,21 +421,12 @@ export function dayTotals(stops: readonly Stop[]): DayTotals {
   return { stops: stops.length, delivered, outstanding, unassigned, riders: riders.size, value };
 }
 
-/** One day as Fiesta wants it, and the stepper's arithmetic. */
+/** One day as Fiesta wants it. */
 export function ymd(date: Date): string {
   const pad = (n: number) => String(n).padStart(2, '0');
   return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}`;
 }
 
-export function shiftDay(day: string, by: number): string {
-  const [y, m, d] = day.split('-').map(Number);
-  // Local midnight, then step. Constructing from the parts rather than parsing
-  // the string avoids the UTC shift that would move the whole board a day.
-  const date = new Date(y ?? 1970, (m ?? 1) - 1, d ?? 1);
-  date.setDate(date.getDate() + by);
-  return ymd(date);
-}
-
 export function isToday(day: string): boolean {
   return day === ymd(new Date());
 }