Upgrade Convex environment variable configuration

[Tyler-Petrov]

• Upgrade Convex peer dependency to ^1.39.0
• Pass typed environment variables into Resend configuration
• Document the new environment configuration workflow

This PR implements Convex's new env variable handling into the Resend component. This change isn't exactly backwards compatible, so I'm not sure what the process is there (maybe a new major release like PostHog). The implementation is super simple and straight forward.

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Reviewing files that changed from the base of the PR and between 2514e1a and 6a6b664.

📒 Files selected for processing (1)

• README.md

📝 Walkthrough

Walkthrough

The Resend client now requires an explicit apiKey and no longer reads environment-variable defaults internally. The example Convex app defines typed RESEND_API_KEY and optional RESEND_WEBHOOK_SECRET values, and documentation and example code pass them through env. The Convex peer dependency requirement is updated to ^1.39.0.

Possibly related PRs

• get-convex/resend#60: Updates the manual email flow and Resend SDK setup using Convex environment values.

Suggested reviewers: ianmacartney

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adopting Convex environment variable configuration.
Description check	✅ Passed	The description matches the changeset, covering the peer dependency upgrade, typed env wiring, and documentation updates.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Around line 33-48: Add a conditional setup instruction near the RESEND_API_KEY
configuration explaining that users enabling webhook flows must also set
RESEND_WEBHOOK_SECRET to the Resend webhook signing secret; keep it optional for
users who do not use webhooks.
- Around line 142-143: Update the webhook example’s import from
`@convex-dev/resend` to include vOnEmailEventArgs alongside the existing symbols,
so the usage in the webhook handler resolves correctly.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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📥 Commits

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⛔ Files ignored due to path filters (3)

• example/convex/_generated/server.d.ts is excluded by !**/_generated/**
• example/convex/_generated/server.js is excluded by !**/_generated/**
• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (5)

• README.md
• example/convex/convex.config.ts
• example/convex/example.ts
• package.json
• src/client/index.ts