feat(app): clean architecture with typed repositories, DTO models and calendar event logos

FinlyticApp/lib/features/news/repositories/news_repository.dart

@@ -23,6 +23,8 @@ class NewsRepository {
     String? symbol,
     String? isin,
     String? date,
+    String? query,
+    bool? hasSentiment,
   }) async {
     try {
       final Map<String, dynamic> queryParams = {
@@ -33,17 +35,21 @@ class NewsRepository {
       if (symbol != null && symbol.isNotEmpty) queryParams['symbol'] = symbol;
       if (isin != null && isin.isNotEmpty) queryParams['isin'] = isin;
       if (date != null && date.isNotEmpty) queryParams['date'] = date;
+      if (query != null && query.isNotEmpty) queryParams['query'] = query;
+      if (hasSentiment == true) queryParams['hasSentiment'] = true;
 
       final response = await apiClient.get('/api/v1/news', queryParameters: queryParams);
 
-      if (response.statusCode == 200) {
+      if (response.statusCode == 200 && response.data is List) {
         final List<dynamic> data = response.data;
-        return data.map((json) => NewsArticleModel.fromJson(json)).toList();
+        return data
+            .whereType<Map<String, dynamic>>()
+            .map((json) => NewsArticleModel.fromJson(json))
+            .toList();
       }
       return [];
     } catch (e) {
-      print('Error fetching news: $e');
-      throw Exception('Failed to load news');
+      throw Exception('Failed to load news: $e');
     }
   }