- améliore l'export/import (format de fichiers en paramètres, amélioration de la robustesse, )

- ajout bouton tout effacer des propositions et participants

package.json

@@ -29,6 +29,7 @@
     "@supabase/supabase-js": "^2.56.0",
     "@types/dompurify": "^3.0.5",
     "@types/nodemailer": "^7.0.1",
+    "@types/qrcode": "^1.5.5",
     "@types/xlsx": "^0.0.35",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -37,6 +38,7 @@
     "lucide-react": "^0.541.0",
     "next": "15.5.0",
     "nodemailer": "^7.0.5",
+    "qrcode": "^1.5.4",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "tailwind-merge": "^3.3.1",