import ods/xls en + de csv

fix modal behavior on close, fine tune import file modal

src/components/CreateCampaignModal.tsx

@@ -54,8 +54,19 @@ export default function CreateCampaignModal({ isOpen, onClose, onSuccess }: Crea
     }));
   };
 
+  const handleClose = () => {
+    setFormData({
+      title: '',
+      description: '',
+      budget_per_user: '',
+      spending_tiers: ''
+    });
+    setError('');
+    onClose();
+  };
+
   return (
-    <Dialog open={isOpen} onOpenChange={onClose}>
+    <Dialog open={isOpen} onOpenChange={handleClose}>
       <DialogContent className="sm:max-w-[500px]">
         <DialogHeader>
           <DialogTitle>Créer une nouvelle campagne</DialogTitle>
@@ -126,7 +137,7 @@ export default function CreateCampaignModal({ isOpen, onClose, onSuccess }: Crea
           </div>
           
           <DialogFooter>
-            <Button type="button" variant="outline" onClick={onClose}>
+            <Button type="button" variant="outline" onClick={handleClose}>
               Annuler
             </Button>
             <Button type="submit" disabled={loading}>