First of four PRs replacing the onboarding wizard with the journey flow
(dev_docs/onboarding_migration_plan.md, local). No UI change.
- Move deriveFirstYearDefaults + parseStartMonthDay out of
WelcomeOnboarding into lib/company/first-year-defaults.ts and unit-test
them (11-vs-13-months boundary, UTC month seeding, malformed input).
- Add the missing computeFiscalPeriod unit tests (calendar year, brutet
ar, first year short/extended, EF calendar-year rule, period names,
BFL 3 kap. 6-18 month window errors).
- New shared fetchCompanyLookup() client: the single client path to the
Lens-backed /lookup, typed outcomes (found / not_found / disabled /
error / aborted), never throws. Fixes the 403/404 conflation: the
dispatcher's 404 ("Extension not found") and feature-flag 503
(EXTENSION_DISABLED) now degrade silently instead of rendering as
"company not found"; only the TIC handler's own 404 does.
- Step2CompanyDetails consumes the helper; identical UX otherwise.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Jakob Wennberg
f9ef8913ae