Improve visual layout and appearance of key elements on the platform

Adjusts the styling of the dashboard and new sale form for better icon visibility.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/b77c9129-16e4-4c03-a447-09edfb2aa967.jpg

client/src/components/NewSaleForm.tsx

@@ -179,8 +179,8 @@ export default function NewSaleForm() {
             {/* Seller Information */}
             <div className="modern-card bg-muted bg-opacity-30 mobile-form-section rounded-xl border-l-4 border-primary">
               <h3 className="mobile-header-responsive font-semibold text-foreground mb-4 sm:mb-6 flex items-center gap-2 sm:gap-3">
-                <div className="p-1.5 sm:p-2 bg-primary bg-opacity-10 rounded-lg">
-                  <User className="h-4 w-4 sm:h-5 sm:w-5 text-primary" />
+                <div className="p-2 sm:p-3 bg-primary bg-opacity-20 rounded-lg flex items-center justify-center">
+                  <User className="h-5 w-5 sm:h-6 sm:w-6 text-primary" />
                 </div>
                 <span className="truncate">Informations Vendeur</span>
               </h3>