Allow directors to validate DLCs and fix validation button visibility

Correct the product status check for validation and grant 'directeur' role the ability to see the validate button in DlcPage.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a3de0820-9397-41b2-b000-7931ee9c29de
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/a3de0820-9397-41b2-b000-7931ee9c29de/emyZ6I3

client/src/pages/DlcPage.tsx

@@ -282,7 +282,8 @@ export default function DlcPage() {
     const daysUntilExpiry = Math.ceil((expiry.getTime() - today.getTime()) / (1000 * 60 * 60 * 24));
     
     // Afficher le bouton si le produit expire dans 15 jours ou moins, ou est déjà expiré
-    return (daysUntilExpiry <= 15 && product.status !== "valide");
+    // ET si le produit n'est pas déjà validé
+    return (daysUntilExpiry <= 15 && product.status !== "valides");
   };
 
   const getStatusBadge = (status: string, dlcDate: string | null) => {
@@ -791,7 +792,7 @@ export default function DlcPage() {
                             >
                               <Edit className="w-4 h-4" />
                             </Button>
-                            {shouldShowValidateButton(product) && (user?.role === 'admin' || user?.role === 'manager') && (
+                            {shouldShowValidateButton(product) && (user?.role === 'admin' || user?.role === 'manager' || user?.role === 'directeur') && (
                               <Button
                                 variant="default"
                                 size="sm"