Refactor pos send 2

[r1n04h]

Note

Updates POS amount handling to consider a positive amountMin with amountMax === 0 as a fixed payment across logic and UI.

• POS amount handling (mobile/app/PosMerchant.tsx):
  • Treats payments as fixed when (amountMin === amountMax && amountMin > 0) || (amountMin > 0 && amountMax === 0).
    • Initialization: sets fixed amount input based on minZar.
    • Calculation: totalAmount returns minZar for fixed payments.
    • Validation: skips amountError for fixed payments.
    • UI: shows fixed amount display instead of entry for fixed payments.

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