feat(admin): enhance editor UI (links, image captions) & fix categories

Added animated auto-opening link modal, custom image node with isolated caption deletion, fixed single-select category data binding, improved featured image layout, and updated README.

frontend/src/components/ArticleMeta.tsx

@@ -1,6 +1,7 @@
 import { CalendarIcon, ClockIcon } from 'lucide-react'
 import type { Article } from '../data/site'
 import { JALALI_TIME_FORMATTER, formatJalali } from '../utils/date'
+import { toPersianDigits } from '../utils/digits'
 
 type ArticleMetaProps = {
   article: Article
@@ -41,11 +42,11 @@ export function ArticleMeta({ article, className = '' }: ArticleMetaProps) {
         {dateLabel}
       </span>
 
-      {/* زمان مطالعه */}
+      {/* زمان مطالعه — با ارقام فارسی */}
       {article.read && (
         <span className="flex items-center gap-2 text-xs font-light text-ivory/60">
           <ClockIcon className="h-3.5 w-3.5 text-copper" aria-hidden="true" />
-          {article.read}
+          {toPersianDigits(article.read)}
         </span>
       )}
     </div>