- Settings API: GET/PUT /api/settings/:key with SQLite persistence
- useSettings hook with TanStack Query for settings CRUD
- OnboardingWizard: 3-step modal overlay (welcome, create category, add item)
- Root layout checks onboarding completion flag before rendering wizard
- Skip option available at every step, all paths persist completion to DB
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
