v0.2.1

Added

• Client-side input validation — All resource methods validate inputs before sending network requests (Short ID format, currency/country codes, amount strings, enum values, etc.). Errors throw WaffoPancakeError with status: 400 and layer: "sdk".

Fixed

• RefundTicketStatus — Added 3 missing values: UnderReview, Returned, Cancelled
• RefundTicket — Fixed nullability for currentVersionId, versionNumber, versionData; added missing createdAt, updatedAt fields
• JSDoc — Corrected numeric amount examples to display-format strings

See CHANGELOG for full details.