- Replace month dropdown with date picker (Du/Au) + Appliquer button
- Add fournisseur filter dropdown (client-side, all suppliers from current data)
- Totals update live when fournisseur filter changes
- SQL: use BETWEEN date range instead of TO_CHAR month match
- Create user button: proper 3-col form layout so button stays on one line
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>