Reads the ERP-exported "Distinta Base" file (SpreadsheetML XML or real
binary .xls/.xlsx via ExcelDataReader), extracts Componente/Descrizione,
writes a CSV and previews it in a new tab alongside the existing CAD
search. Also ignore the exported Excel/CSV files dropped in the repo root.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
