Validate email template variables at render time

[RUKAYAT-CODER]

Background

Missing template variables render as empty strings. Validate provided variables against the template schema.

Files to modify (2-3)

src/lib/email/templates.ts
src/lib/email/types.ts

Acceptance Criteria

Implemented across the listed files

Unit/integration tests added or updated and passing

No regression; follows project coding standards

[Wiseman52]

@Wiseman52 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, kindly assign task. I’ve carefully reviewed the requirements and understand what is needed to resolve the issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Wiseman52 to this issue.

[morenike69]

@morenike69 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to work on this issue, please assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @morenike69 to this issue.

[ThatCodeBabe]

@ThatCodeBabe has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, can i handle this ?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ThatCodeBabe to this issue.

[drips-wave]

Congratulations, @ThatCodeBabe! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @ThatCodeBabe: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @ThatCodeBabe as part of the Stellar Wave Program's 8th Wave 🥳

😎 @ThatCodeBabe: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.