Use toFixed for number -> Decimal conversion

Author: webmaster128

packages/stargate/src/feemarket.ts

@@ -40,7 +40,7 @@ export function multiplyDecimalByNumber(
   const normalizedValue = value.adjustFractionalDigits(fractionalDigits);
 
   // Convert multiplier to Decimal with same fractional digits
-  const multiplierDecimal = Decimal.fromUserInput(multiplier.toString(), fractionalDigits);
+  const multiplierDecimal = Decimal.fromUserInput(multiplier.toFixed(fractionalDigits), fractionalDigits);
 
   // Multiply: (value * multiplier) / 10^fractionalDigits
   const factor = BigInt(10) ** BigInt(fractionalDigits);