feat(app): add evaluation history, bot control panel, simulation visualizer, and vendored signalr_core

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

@@ -1,21 +1,30 @@
-import 'dart:async';
-import 'dart:convert';
-import 'package:signalr_core/signalr_core.dart';
 import 'package:finlytic_app/core/network/api_client.dart';
+import 'package:finlytic_app/core/network/signalr_service.dart';
 import 'package:finlytic_app/features/news/models/news_article_model.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 
 class NewsRepository {
   final ApiClient apiClient;
   final String backendUrl;
-  final FlutterSecureStorage secureStorage = const FlutterSecureStorage();
-  
-  HubConnection? _hubConnection;
-  final _liveNewsController = StreamController<NewsArticleModel>.broadcast();
 
-  Stream<NewsArticleModel> get liveNewsStream => _liveNewsController.stream;
+  /// Central Real-Time WebSocket service (shared, authenticated `/hubs/news` connection).
+  /// May be null for call-sites that only need REST access (e.g. one-off dialogs) and
+  /// don't require the live feed; in that case [liveNewsStream] yields no events.
+  final SignalRService? signalRService;
 
-  NewsRepository({required this.apiClient, required this.backendUrl});
+  NewsRepository({
+    required this.apiClient,
+    required this.backendUrl,
+    this.signalRService,
+  });
+
+  /// Live news articles pushed by the central SignalRService's `/hubs/news` connection.
+  /// The connection itself is established centrally (see `SignalRService.initSignalR()`),
+  /// so this repository only maps the already-authenticated stream to typed models.
+  Stream<NewsArticleModel> get liveNewsStream {
+    final signalR = signalRService;
+    if (signalR == null) return const Stream.empty();
+    return signalR.newsArticleStream.map(NewsArticleModel.fromJson);
+  }
 
   Future<List<NewsArticleModel>> fetchNews({
     int page = 1,
@@ -31,7 +40,7 @@ class NewsRepository {
         'page': page,
         'pageSize': pageSize,
       };
-      
+
       if (symbol != null && symbol.isNotEmpty) queryParams['symbol'] = symbol;
       if (isin != null && isin.isNotEmpty) queryParams['isin'] = isin;
       if (date != null && date.isNotEmpty) queryParams['date'] = date;
@@ -66,55 +75,9 @@ class NewsRepository {
     }
   }
 
-  Future<void> connectToLiveFeed() async {
-    if (_hubConnection != null && _hubConnection!.state == HubConnectionState.connected) {
-      return;
-    }
-
-    try {
-      final token = await secureStorage.read(key: 'auth_token');
-      final hubUrl = '$backendUrl/hubs/news${token != null ? '?access_token=$token' : ''}';
-
-      _hubConnection = HubConnectionBuilder()
-          .withUrl(hubUrl, HttpConnectionOptions(
-            logging: (level, message) => print(message),
-          ))
-          .withAutomaticReconnect()
-          .build();
-
-      _hubConnection!.on('ReceiveNewArticle', (arguments) {
-        if (arguments != null && arguments.isNotEmpty) {
-          try {
-            // SignalR might send it as a Map or raw JSON depending on .NET format
-            final dynamic rawPayload = arguments[0];
-            final Map<String, dynamic> jsonData = rawPayload is String 
-                ? jsonDecode(rawPayload) 
-                : Map<String, dynamic>.from(rawPayload);
-                
-            final article = NewsArticleModel.fromJson(jsonData);
-            _liveNewsController.add(article);
-          } catch (e) {
-            print('Error parsing live article: $e');
-          }
-        }
-      });
-
-      await _hubConnection!.start();
-      print('Connected to News Live Feed');
-    } catch (e) {
-      print('Error connecting to News Live Feed: $e');
-    }
-  }
-
-  Future<void> disconnectFromLiveFeed() async {
-    if (_hubConnection != null) {
-      await _hubConnection!.stop();
-      _hubConnection = null;
-    }
-  }
-
-  void dispose() {
-    _liveNewsController.close();
-    disconnectFromLiveFeed();
-  }
+  /// No-op: the underlying `/hubs/news` WebSocket connection is owned and
+  /// lifecycle-managed centrally by [SignalRService] (started once in
+  /// `main.dart` after authentication), so this repository has nothing of
+  /// its own to dispose.
+  void dispose() {}
 }