feat(receiving): add html_format query param to get

[drish]

Summary by cubic

Add support for an optional html_format query param on receiving email GET requests to control HTML content format. No breaking changes; existing calls still work.

• New Features
  • Resend::Emails::Receiving.get(id, params = {}) accepts html_format (e.g., "sanitized", "raw") and URL-encodes it into the query.
  • Spec verifies html_format=sanitized is sent and the response is handled correctly.

^{Written for commit 34702ec. Summary will update on new commits.}

[cubic-dev-ai]

2 issues found across 2 files

Confidence score: 4/5

• In lib/resend/emails/receiving.rb, using PaginationHelper.build_paginated_path for html_format creates a semantic mismatch that could fail if the helper later enforces pagination-only params, causing email-receiving URLs to break unexpectedly — switch to a format-specific path builder or append html_format separately before merging.
• In spec/emails/receiving_spec.rb, a test description still uses “should,” which can violate suite conventions and trigger lint/CI friction even though runtime behavior is unaffected — rename the example text to match the no-should style before merging to keep the test suite clean and consistent.

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