fix: inbound attachment types mismatch API values

[gabrielmfern]

Summary by cubic

Align inbound attachment types with the API by allowing null for filename, content_id, and content_disposition. This removes type mismatches in receiving email and webhook payloads.

• Bug Fixes
  • GetReceivingEmailResponseSuccess.attachments: filename, content_id, and content_disposition are now string | null.
  • ReceivedEmailAttachment: filename and content_disposition are nullable; content_id is string | null (no longer optional).
  • Prevents type errors and parsing issues when the API returns null values.

^{Written for commit bbff122. Summary will update on new commits.}

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npm i https://pkg.pr.new/resend/resend-node/resend@828

commit: bbff122

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

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