fix: enforce semantic contrast across admin

src/app/admin/users/[id]/edit/page.tsx

@@ -63,11 +63,11 @@ export default async function AdminUserEdit({ params }: { params: Promise<{ id:
   } catch {
     return (
       <main>
-        <p className="text-sm text-gray-500 dark:text-gray-400">
+        <p className="text-sm theme-text-muted dark:theme-text-muted">
           <Link href="/admin/users">← {t("title")}</Link>
         </p>
         <h1>{t("title")}</h1>
-        <p className="text-xs text-gray-500 dark:text-gray-400">{t("loadError")}</p>
+        <p className="text-xs theme-text-muted dark:theme-text-muted">{t("loadError")}</p>
       </main>
     );
   }
@@ -76,7 +76,7 @@ export default async function AdminUserEdit({ params }: { params: Promise<{ id:
 
   return (
     <main>
-      <p className="text-sm text-gray-500 dark:text-gray-400 mb-2">
+      <p className="text-sm theme-text-muted dark:theme-text-muted mb-2">
         <Link href={`/admin/users/${user.id}`}>← {user.username}</Link>
       </p>
       <div className="flex items-center gap-3 mb-6">
@@ -141,7 +141,7 @@ export default async function AdminUserEdit({ params }: { params: Promise<{ id:
           </label>
         </div>
 
-        <p className="text-xs text-gray-500 dark:text-gray-400">{t("hint")}</p>
+        <p className="text-xs theme-text-muted dark:theme-text-muted">{t("hint")}</p>
 
         <div className="flex gap-2 mt-2">
           <button type="submit" className="btn btn-primary">