import ods/xls en + de csv

fix modal behavior on close, fine tune import file modal

src/components/AddPropositionModal.tsx

@@ -64,8 +64,20 @@ export default function AddPropositionModal({ isOpen, onClose, onSuccess, campai
     }));
   };
 
+  const handleClose = () => {
+    setFormData({
+      title: '',
+      description: '',
+      author_first_name: 'admin',
+      author_last_name: 'admin',
+      author_email: 'admin@example.com'
+    });
+    setError('');
+    onClose();
+  };
+
   return (
-    <Dialog open={isOpen} onOpenChange={onClose}>
+    <Dialog open={isOpen} onOpenChange={handleClose}>
       <DialogContent className="sm:max-w-[500px]">
         <DialogHeader>
           <DialogTitle>Ajouter une proposition</DialogTitle>
@@ -149,7 +161,7 @@ export default function AddPropositionModal({ isOpen, onClose, onSuccess, campai
           </div>
           
           <DialogFooter>
-            <Button type="button" variant="outline" onClick={onClose}>
+            <Button type="button" variant="outline" onClick={handleClose}>
               Annuler
             </Button>
             <Button type="submit" disabled={loading}>