fix(organizations): save pending balance alert email

[jeanduplessis]

Summary

Allow organization owners to save a minimum balance alert with a valid email still in the notification input.

Why this change is needed

The modal previously required users to press the add button before Save became available. For the common single-recipient case, the populated email field looked complete even though the address had not been added to the internal recipient list.

How this is addressed

• Treat a valid pending email as a recipient when determining whether Save is available.
• Add the pending address automatically when saving while preserving multi-recipient support.
• Reject invalid pending input instead of silently omitting it.
• Trim and deduplicate pending addresses.
• Improve email-field guidance and accessible labels.
• Add focused coverage for first, additional, duplicate, invalid, and empty pending-address cases.

Human Verification

• Evaluated recipient resolution directly for single-recipient, multi-recipient, duplicate, invalid, and empty-input behavior.

Reviewer Notes

Human Reviewer Flags

• The add button remains available for multiple recipients, but it is no longer required for the single-recipient path.

Code Reviewer Agent

Code Reviewer Notes

• Client-side email syntax validation remains consistent with the modal's existing behavior.
• The server continues to enforce a positive threshold and at least one valid notification email.
• The focused Jest suite could not run locally because PostgreSQL and Docker were unavailable; web typecheck and lint passed.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the pending-email resolution logic, modal save-gating, and accessibility updates; found no correctness or security issues in the changed lines.

Files Reviewed (3 files)

• apps/web/src/components/organizations/SpendingAlertsModal.tsx
• apps/web/src/components/organizations/spending-alerts-form.ts
• apps/web/src/components/organizations/SpendingAlertsModal.test.ts

---

_{Reviewed by claude-sonnet-5 · Input: 16 · Output: 4.5K · Cached: 297.9K}

_{Review guidance: REVIEW.md from base branch main}