Improve user interaction with validation and processing buttons

Add `data-testid` attributes to the "Validate" and "Mark Processed" buttons in the DlcPage for improved testing and add a title to the "Validate" button.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 1e4433b5-47ab-464c-b663-fea2e53367dd
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/1e4433b5-47ab-464c-b663-fea2e53367dd/px42AkO

.replit

@@ -19,10 +19,6 @@ externalPort = 80
 localPort = 33873
 externalPort = 3003
 
-[[ports]]
-localPort = 37973
-externalPort = 4200
-
 [[ports]]
 localPort = 38343
 externalPort = 3000
@@ -31,6 +27,10 @@ externalPort = 3000
 localPort = 38451
 externalPort = 3002
 
+[[ports]]
+localPort = 41077
+externalPort = 5000
+
 [[ports]]
 localPort = 41343
 externalPort = 3001

client/src/pages/DlcPage.tsx

@@ -927,6 +927,8 @@ export default function DlcPage() {
                                 onClick={() => handleValidate(product.id)}
                                 disabled={validateMutation.isPending}
                                 className="bg-green-600 hover:bg-green-700"
+                                data-testid={`button-validate-${product.id}`}
+                                title="Valider définitivement ce produit"
                               >
                                 <CheckCircle className="w-4 h-4" />
                               </Button>
@@ -943,6 +945,7 @@ export default function DlcPage() {
                                       onClick={() => handleMarkProcessed(product.id)}
                                       disabled={markProcessedMutation.isPending}
                                       className="border-blue-300 text-blue-700 hover:bg-blue-50"
+                                      data-testid={`button-mark-processed-${product.id}`}
                                     >
                                       <CheckCircle2 className="w-4 h-4" />
                                     </Button>