Type the email event mutation argument

[Tyler-Petrov]

This PR adds a type cast for the event parameter of the handleEmailEvent mutation. It doesn't change the runtime at all just the type of the event param.

[coderabbitai]

📝 Walkthrough

Walkthrough

The email webhook mutation now declares its event argument as VAny<EmailEvent> rather than an untyped value. The test helper’s mutation call explicitly casts its event payload to EmailEvent. The runtime execution flow remains unchanged.

Suggested reviewers: ianmacartney, sethconvex

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: typing the email event mutation argument.
Description check	✅ Passed	The description matches the change and accurately says it only affects typing, not runtime behavior.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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