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// Merge overlapping booking intervals
export function mergeSlots(slots: Slot[]): Slot[] {
const sorted = [...slots].sort((a, b) => a.start - b.start);
return sorted.reduce((acc, s) => {
const last = acc.at(-1);
if (last && s.start <= last.end) last.end = Math.max(last.end, s.end);
else acc.push({ ...s });
return acc; }, [] as Slot[]);
