feat: flag products whose last registered supplier differs from current view

Instead of unreliable preference=1, use artfou1.no_id DESC (most recently
added artfou1 entry) to identify the last supplier for each product.
Shows an amber warning icon in the Désignation column when the last
supplier ≠ current supplier view, with tooltip showing who to attribute
the sales to.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/features/grid/api/get-product-rows.ts

@@ -70,6 +70,8 @@ export async function getProductRows(input: GetProductRowsInput): Promise<Produc
                 codein: art.codein,
                 codeFournisseur: art.codefou ?? codeFournisseur,
                 nomFournisseur: art.nomfou ?? "",
+                fournisseurPrincipalCode: art.codefou_principal ?? undefined,
+                fournisseurPrincipalNom: art.nomfou_principal ?? undefined,
                 libelle1: art.libelle1 ?? "",
                 gtin: art.gtin ?? "",
                 reference: art.reference ?? "",