feat: add batch email updates

[cpenned]

Summary by cubic

Adds support for attachments, scheduledAt, and tags in batch emails. Batch options now match single email options so these fields are forwarded to the API.

• New Features
  • Use CreateEmailOptions for CreateBatchEmailOptions to enable attachments, scheduledAt, and tags.
  • Add a test to confirm attachments and tags are forwarded in batch requests.

^{Written for commit e07d30f. Summary will update on new commits.}

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commit: e07d30f

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Release preview

Package	Bump	Version
resend	minor	6.17.2 → 6.18.0

Changelogs in this PR

Changelog	Title
2026-07-10-batch-email-options.md	support attachments, scheduledAt, and tags in batch emails

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[cubic-dev-ai]

All reported issues were addressed across 3 files

Confidence score: 5/5

• Safe to merge after the addressed issues were fixed.

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

<sub>Requires human review: Adds attachments, scheduledAt, and tags to batch email options. This is a functional change that requires human review to ensure API compatibility.

Re-trigger cubic</sub>