Apply flat design to commission info

Applied flat design principles to the commission info page, including removing background gradients and simplifying borders.

Author: lovable-dev[bot]

src/pages/CommissionInfoPage.tsx

@@ -86,7 +86,7 @@ export default function CommissionInfoPage() {
   };
 
   return (
-    <div className="min-h-screen bg-background p-4">
+    <div className="min-h-screen bg-slate-50 p-4">
       <div className="max-w-2xl mx-auto space-y-6">
 
         {/* Header avec félicitations */}