fix(email-exporter): ReadableByteStreamController for safari react-email

[YousefED]

Summary

fixes react-email compatibility on safari

Rationale

See notice here: https://github.com/resend/react-email/blob/f02e21e998d507aa3fdfbb7b8639f915b8df6cb5/apps/docs/utilities/render.mdx#3-convert-to-html or reproduce the error in the email-exporter playground

Changes

Add a polyfill for ReadableByteStreamController

Impact

Resetting the polyfill should make sure there's no outside impact

Testing

Tested running the example in safari

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

[vercel]

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Project	Deployment	Review	Updated (UTC)
blocknote	Ready	Preview	Dec 15, 2025 8:56pm
blocknote-agent-demo	Error		Dec 15, 2025 8:56pm
blocknote-website	Ready	Preview	Dec 15, 2025 8:56pm

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commit: 24614fc