Ensure input fields are always displayed with a clean white background

Adds CSS rules to force white backgrounds on input elements across sections.

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-26c014852236/2cf6faac-6516-4c7d-a662-00c8fdde30f5.jpg

client/src/index.css

@@ -426,6 +426,18 @@ body {
   background: #fce7f3 !important; /* Fond rose très clair */
 }
 
+/* S'assurer que tous les inputs ont un fond blanc dans toutes les sections */
+.section-vendor .modern-input,
+.section-product .modern-input,
+.section-client .modern-input,
+.section-identity .modern-input,
+.section-vendor input,
+.section-product input,
+.section-client input,
+.section-identity input {
+  background: white !important;
+}
+
 /* Responsive design */
 @media (max-width: 768px) {
   .section-vendor,