fix: spacing (#2305)

Author: kevbarns

ui/components/IntentionForm.tsx/IntensionFormNavigation.tsx

@@ -1,11 +1,12 @@
+import { fr } from "@codegouvfr/react-dsfr"
 import { Box } from "@mui/material"
 import Image from "next/image"
 
 import { DsfrLink } from "@/components/dsfr/DsfrLink"
 
 export const IntensionFormNavigation = () => {
   return (
-    <Box sx={{ display: "flex", width: "80%", maxWidth: "800px", margin: "auto", pt: 12 }}>
+    <Box sx={{ display: "flex", width: "80%", maxWidth: "800px", margin: "auto", pt: fr.spacing("4w") }}>
       <DsfrLink style={{ backgroundImage: "none" }} href="/">
         <Image src="/images/logo_LBA.svg" alt="" width={160} height={60} style={{ minWidth: "160px" }} />
       </DsfrLink>