fix(orders): fall back to tokenId when tokenIds is empty

[umeeSthein]

Summary

• fall back to tokenId when tokenIds is an empty array in serializeOrdersQueryOptions
• add a regression test for the tokenIds: [] + tokenId case

Why

When both tokenIds: [] and tokenId are provided, the serializer currently prefers the empty tokenIds array and drops the token filter entirely from the request.

That creates a mismatch with the surrounding validation logic and can send an unfiltered orders request even though a specific tokenId was provided.

Testing

• added a unit test for the empty tokenIds fallback case

[ryanio]

Thanks for this contribution! We've recreated this fix in our internal monorepo and it will be included in the next release sync. Closing this PR as the change will ship from the internal repo — appreciate you flagging it!