* fix(vat): drop personnummer century so enskild firma VAT number is SE+12 not SE+14
Onboarding derived the VAT number as SE${orgNumber}01. For an enskild firma the
org number is a 12-digit personnummer, producing SE + 14 digits, which fails the
^SE\d{12}$ validation — the pre-filled value is re-submitted on save and the tax
settings page becomes unsavable.
New shared helper lib/vat/vat-number.ts (normalize/validate/derive, reusing
normalizeOrgNumber to drop the century + Luhn-validate). UpdateSettingsSchema,
the onboarding wizard, the onboarding upsert in lib/company/actions.ts, and the
arcim-migration provider import all route through it. Backfill migration repairs
existing SE+14 rows to SE+12 (idempotent, scoped to ^SE\d{14}$ only).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* chore(arcim): warn when a provider VAT number is dropped as malformed
The provider VAT guard silently discarded a value that doesn't normalise to a
valid SE+12 momsregistreringsnummer. Emit a structured warn (provider +
company, no raw value — it can embed a personnummer) so consistently-bad
provider data is observable rather than invisible. Addresses the OWASP V16
logging finding on the arcim VAT-normalisation change in this PR.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jakob Wennberg
5bacda4839