441 fq group optional visible defaults covered

autotest-case: 441 scope: group freeQuantity; childRes=False group: fq.441 optional visible defaults covered group restrictions: min=0 max=3 free=2 children: prices=[30, 20, 10] defaults=[1, 1, 0]; child restrictions disabled by childRes=false payload note: Office API requires child row freeOfChargeAmount to mirror group free, but it is not an independent child setting. manual hide group: - manual hide child modifiers: [] expected: quick add chooses the most expensive eligible defaults as free; only group freeQuantity is meaningful because childRes=false disables child min/max/free.