feat: media library with image picker for article forms, browse/upload from folder

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

@@ -1,6 +1,6 @@
 import Link from "next/link";
 import { createArticle } from "@/actions/admin-articles";
-import { RichText } from "@/components/admin/rich-text";
+import { ArticleForm } from "@/components/admin/article-form";
 
 export default function NewArticle() {
   return (
@@ -9,13 +9,7 @@ export default function NewArticle() {
         <Link href="/admin/articles">← Articles</Link>
       </p>
       <h1>New article</h1>
-      <form action={createArticle} className="card" style={{ display: "grid", gap: "0.6rem" }}>
-        <input name="title" placeholder="Title" required />
-        <input name="image" placeholder="Image URL" />
-        <textarea name="shortStory" placeholder="Short story (summary)" rows={2} />
-        <RichText name="fullStory" placeholder="Full story" rows={10} />
-        <button type="submit">Create</button>
-      </form>
+      <ArticleForm action={createArticle} />
     </main>
   );
 }