feat: implement file existence check and improve file upload handling

src/ui/components/internal/create-article-form.tsx

@@ -80,7 +80,10 @@ export const CreateArticleForm = () => {
     });
 
     const title = useWatch({ control: form.control, name: 'title' });
-    const coverImageUrl = useWatch({ control: form.control, name: 'coverImageUrl' });
+    const coverImageUrl = useWatch({
+        control: form.control,
+        name: 'coverImageUrl',
+    });
     useEffect(() => {
         if (!title) return;
         form.setValue('slug', slugify(title).toLowerCase());