Remove integration status element

The user wants to remove the integration status element from the campaign settings header. This is due to issues with testing the integration on the 'Lovable' environment, which requires redeploying to Vercel for each test. The user wants to revert to the previous integration system.

Author: lovable-dev[bot]

src/components/campaign-settings/CampaignSettingsHeader.tsx

@@ -173,11 +173,6 @@ export const CampaignSettingsHeader = ({ activeTab, integrationStatus }: Campaig
                 {errorMessage}
               </p>
             )}
-            {status === 'active' && lastCodeActivity && (
-              <p className="text-xs text-green-600 mt-1">
-                Dernière activité: {new Date(lastCodeActivity).toLocaleDateString('fr-FR')}
-              </p>
-            )}
             {status === 'pending' && (
               <p className="text-xs text-amber-600 mt-1">
                 Vérifiez que le code est bien installé sur votre site