Function equals

frontend/src/utils/sets.ts:19–29

* Check if two sets are equal (contain the same elements).

(set1: Set<T>, set2: Set<T>)

   * Check if two sets are equal (contain the same elements).
   */
  equals<T>(set1: Set<T>, set2: Set<T>): boolean {
    if (set1.size !== set2.size) {
      return false;
    }
    for (const item of set1) {
      if (!set2.has(item)) {
        return false;
      }
    }
    return true;
  },

  /**
   * Return a new set with `item` toggled — removed if present, added if not.