FE-185 Add newsletter signup form submission to NewsletterForm component

[BigBen-7]

Track
Frontend

Difficulty
Trivial

Description
NewsletterForm.tsx renders a form but it is unclear whether form submission is wired to any backend endpoint. Implement the submit handler and validate the email field.

Acceptance Criteria

• Submitting a valid email POSTs to the backend newsletter endpoint.
• Zod validates the email format before submission.
• Success state replaces the form with a confirmation message.
• Duplicate email or server error is shown as an inline error message.

[Joseph-1-Duro]

@Joseph-1-Duro has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I can work on your project

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[ohamamarachi474-del]

@ohamamarachi474-del has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

please kindly assign me to this task sir

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Congratulations, @ohamamarachi474-del! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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[drips-wave]

This issue has been completed by @ohamamarachi474-del as part of the Stellar Wave Program's 5th Wave 🥳

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