- Parse URLSearchParams to detect ?tab=pricelists on page load
- Load tab from URL or default to 'alerts'
- Fixes redirect from /pricelists to /admin/pricing?tab=pricelists
This resolves the critical UX issue where users redirected from
/pricelists would see the 'alerts' tab instead of 'pricelists'.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>