fix: use ref.watch in build() and avoid stale snapshot in loadMore catch

lib/providers/news_provider.dart

@@ -56,7 +56,7 @@ class NewsNotifier extends AsyncNotifier<NewsState> {
 
   @override
   Future<NewsState> build() async {
-    final items = await ref.read(newsApiProvider).getNewsItems(
+    final items = await ref.watch(newsApiProvider).getNewsItems(
           days: 90,
           limit: _limit,
           offset: 0,
@@ -94,7 +94,8 @@ class NewsNotifier extends AsyncNotifier<NewsState> {
         reactions: updatedReactions,
       ));
     } catch (e) {
-      state = AsyncData(current.copyWith(loadingMore: false));
+      final recovered = state.value ?? current;
+      state = AsyncData(recovered.copyWith(loadingMore: false));
       rethrow;
     }
   }
@@ -152,6 +153,6 @@ final feedsProvider =
 class FeedsNotifier extends AsyncNotifier<List<BriefingFeed>> {
   @override
   Future<List<BriefingFeed>> build() async {
-    return ref.read(newsApiProvider).getFeeds();
+    return ref.watch(newsApiProvider).getFeeds();
   }
 }