format
Format amount with thousands separators and decimals.
Return
Formatted string (e.g., "1,234.567890" or "1,234.567890 DUST")
Parameters
amount
Raw amount in base units (BigInteger, must be non-negative)
tokenType
Token type string (e.g., "DUST", "TNIGHT")
includeSymbol
If true, append token symbol (e.g., " DUST")
Throws
if amount is negative