EMCO Compliant is maintained manually in BC, so the pricing column now
fetches it from the new /api/bc-empco endpoint (items API, field
empCOCompliant) on every app load instead of reading the Dropbox matrix.
One fetch per page load, cached across tab switches; sorting uses the
live map.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>