Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/articles/new/page.tsx

@@ -4,11 +4,7 @@ import { Newspaper } from "lucide-react";
 import { createArticle } from "@/actions/admin-articles";
 import { ArticleForm } from "@/components/admin/article-form";
 
-export default async function NewArticle({
-  searchParams,
-}: {
-  searchParams: Promise<{ error?: string }>;
-}) {
+export default async function NewArticle({ searchParams }: { searchParams: Promise<{ error?: string }> }) {
   const { error } = await searchParams;
   const t = await getTranslations("pages.admin.articles");
 
@@ -20,14 +16,12 @@ export default async function NewArticle({
         </div>
         <div>
           <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">{t("form.title")}</h1>
-          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5"><Link href="/admin/articles">← {t("title")}</Link></p>
+          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">
+            <Link href="/admin/articles">← {t("title")}</Link>
+          </p>
         </div>
       </div>
-      {error ? (
-        <p className="text-xs text-red-600 dark:text-red-400 mb-4">
-          Error: {error}
-        </p>
-      ) : null}
+      {error ? <p className="text-xs text-red-600 dark:text-red-400 mb-4">Error: {error}</p> : null}
       <ArticleForm action={createArticle} />
     </main>
   );