Enhance user experience and interface of sales and dashboard sections

Refactor UI components in NewSaleForm.tsx, SalesHistory.tsx, index.css, validation.ts, and Dashboard.tsx for improved UX.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: dec54137-d5a2-4406-8ad4-5f2f9fb110bf
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/c74640af-aff6-4467-98ef-6922e186fed2.jpg

client/src/lib/validation.ts

@@ -27,8 +27,8 @@ export function validateRequiredFields(formData: any): string[] {
     { key: 'modePaiement', label: 'Mode de paiement' },
     { key: 'typeIdentite', label: 'Type de pièce d\'identité' },
     { key: 'numeroIdentite', label: 'Numéro de pièce d\'identité' },
-    { key: 'autoriteDelivrance', label: 'Autorité de délivrance' },
     { key: 'dateDelivrance', label: 'Date de délivrance' }
+    // Note: autoriteDelivrance n'est plus obligatoire
   ];
   
   return requiredFields