fix(exchange): reject sub-minimum native amounts in VerifiedFiatCalculator#816
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…lator Tiny bonding-curve sell estimates (e.g. ₦0.003 for a low-supply token) pass the existing zero guard but round to ₦0.00 at display precision, causing the server to reject with "native amount is less than minimum transfer value." Validate at the source so all callers surface a proper error instead of silently dropping the bill.
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Tiny bonding-curve sell estimates (e.g. ₦0.003 for a low-supply token) pass the existing zero guard but round to ₦0.00 at display precision, causing the server to reject with "native amount is less than minimum transfer value." Validate at the source so all callers surface a proper error instead of silently dropping the bill.