(janitor/dedupe): consolidate isValidEmail in dev seed topics

[kilo-code-bot]

Summary

Seven dev/seed/app/* topic files re-declared the same permissive email regex locally:

/^[^\s@]+@[^\s@]+\.[^\s@]+$/

An authoritative implementation already exists in dev/seed/lib/users.ts and is already imported by three other topic files (usage-evidence, github-account, byok-e2e-fixture). This consolidates the remaining copies to use it.

Change

• Remove the local isValidEmail in 7 topic files and import isValidEmail from ../lib/users.
• Net: 7 insertions, 33 deletions. No behavior change — identical regex.

Verification

• oxfmt: clean
• oxlint: 0 errors / 0 warnings
• tsx import smoke test: all 7 modules load

Notes

The apps/web/src/components/organizations/spending-alerts-form.ts copy is intentionally left alone: it has different semantics (trims before matching) and lives in a different runtime/package.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (7 files)

• dev/seed/app/api-token.ts
• dev/seed/app/create-user.ts
• dev/seed/app/kilo-pass-stripe.ts
• dev/seed/app/mobile-sheet-fixtures.ts
• dev/seed/app/paged-history.ts
• dev/seed/app/session-pr-link.ts
• dev/seed/app/user-id.ts

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_{Reviewed by grok-4.6 · Input: 32K · Output: 4.3K · Cached: 119K}

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