fix news,

lib/features/news/data/models/blog_post_model.dart

@@ -86,12 +86,12 @@ class BlogPostModel {
       }
     }
 
-    // Extract excerpt from blogIntro or metaDescription
-    final excerpt = blogIntro ?? metaDescription ?? '';
-
     // Use content_html preferentially, fall back to content
     final htmlContent = contentHtml ?? content;
 
+    // Excerpt is ONLY from blog_intro (plain text)
+    final excerpt = blogIntro ?? '';
+
     // Use meta image with full URL path
     String imageUrl;
     if (metaImage != null && metaImage!.isNotEmpty) {
@@ -117,7 +117,9 @@ class BlogPostModel {
     return NewsArticle(
       id: name,
       title: title,
-      excerpt: excerpt.length > 200 ? '${excerpt.substring(0, 200)}...' : excerpt,
+      excerpt: excerpt.isNotEmpty
+          ? (excerpt.length > 300 ? '${excerpt.substring(0, 300)}...' : excerpt)
+          : 'Không có mô tả',
       content: htmlContent,
       imageUrl: imageUrl,
       category: category,