fix : use ghost variant for nav button to dashboard

app/admin/[character]/[page]/page.tsx

@@ -66,7 +66,7 @@ export default async function StructuredEditorPage({
       <main className="mx-auto flex w-full max-w-6xl flex-col gap-6 p-4 sm:p-6 lg:p-8">
         <header className="flex items-center gap-4">
           <Button
-            variant="outline"
+            variant="ghost"
             size="icon"
             render={<Link href="/admin" />}
             nativeButton={false}

app/admin/[character]/page.tsx

@@ -40,7 +40,7 @@ export default async function GuideOverviewPage({ params }: { params: Promise<{
       <AdminHeader />
       <main className="mx-auto flex w-full max-w-6xl flex-col gap-8 p-4 sm:p-6 lg:p-8">
         <header className="flex flex-wrap items-center gap-4">
-          <Button variant="outline" size="icon" render={<Link href="/admin" />} nativeButton={false} aria-label="กลับ Dashboard">
+          <Button variant="ghost" size="icon" render={<Link href="/admin" />} nativeButton={false} aria-label="กลับ Dashboard">
             <ArrowLeftIcon />
           </Button>
           <div className="relative size-16 overflow-hidden rounded-lg border">