chore: Application du design system

Front-End/src/components/EmptyState.js

@@ -0,0 +1,36 @@
+import React from 'react';
+import { Inbox } from 'lucide-react';
+
+const EmptyState = ({
+  icon: Icon = Inbox,
+  title,
+  description,
+  actionLabel,
+  onAction,
+  actionIcon: ActionIcon,
+}) => {
+  return (
+    <div className="flex flex-col items-center justify-center py-12 px-4 text-center">
+      <div className="bg-neutral p-4 rounded-full mb-4">
+        <Icon size={40} className="text-gray-400" />
+      </div>
+      <h3 className="font-headline text-lg font-semibold text-gray-700 mb-2">
+        {title}
+      </h3>
+      {description && (
+        <p className="text-sm text-gray-500 max-w-md mb-6">{description}</p>
+      )}
+      {actionLabel && onAction && (
+        <button
+          onClick={onAction}
+          className="flex items-center gap-2 bg-primary hover:bg-secondary text-white font-label font-medium px-6 py-2.5 rounded transition-colors min-h-[44px]"
+        >
+          {ActionIcon && <ActionIcon size={18} />}
+          {actionLabel}
+        </button>
+      )}
+    </div>
+  );
+};
+
+export default EmptyState;