Harden password reset email delivery feedback

[leoisadev1]

Summary

• stop the password reset form from echoing the submitted email or claiming delivery
• log Resend accepted/rejected outcomes with purpose and domains, without secrets/full addresses
• restore hard failures for missing transactional email config and tag notification delivery emails

Verification

• bun test scripts/auth-email.test.ts
• bun run lint
• bun run check-types
• bun run build

Production finding

• Convex production logs show Resend rejected the reset email because amend.sh is not verified in Resend
• current DNS does not expose Resend records for amend.sh; domain verification still needs to be completed in Resend/Vercel DNS for real delivery

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Summary by cubic

Hardened the password reset flow to avoid leaking email addresses or implying delivery. Added strict config checks and provider outcome logging to improve security and observability.

• Bug Fixes
  • UI no longer echoes the submitted email; shows “Reset requested” with generic guidance.
  • Transactional email now throws if RESEND_API_KEY or EMAIL_FROM is missing.
  • Logs provider accepted/rejected outcomes with purpose and sender/recipient domains (no secrets).
  • Tags emails with purpose (password_reset, notification_delivery) for clearer logs.
  • Added tests to verify UI copy and logging markers.

^{Written for commit b71709c. Summary will update on new commits. Review in cubic}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 382e70c1-65aa-471a-b2b2-a5aa047a0b32

📥 Commits

Reviewing files that changed from the base of the PR and between da84fba and b71709c.

📒 Files selected for processing (4)

• apps/web/src/components/sign-in-form.tsx
• packages/backend/convex/amendTransactionalEmails.ts
• packages/backend/convex/httpRuntimeDeliveries.ts
• scripts/auth-email.test.ts

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[cubic-dev-ai]

No issues found across 4 files

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