Menishai

/**
 * get3rdPlaceAssignments
 *
 * Given the 8 groups whose 3rd-place teams qualified, returns a mapping of
 * which 3rd-place team faces each group winner in the Round of 32.
 *
 * @param qualifiedGroups - Array of 8 group letters, e.g. ["A","B","C","D","E","F","G","H"]
 * @returns Record<string, string> mapping slot → 3rd-place team identifier
 *          e.g. { "1A": "3E", "1B": "3J", "1D": "3I", ... }
 *          Returns null if the combination is not found in the table.