refactor: optimize codebase

lib/core/providers/app_providers.dart

@@ -126,10 +126,13 @@ final activeServerProvider = FutureProvider<ServerConfig?>((ref) async {
 
   if (activeId == null || configs.isEmpty) return null;
 
-  return configs.firstWhere(
-    (config) => config.id == activeId,
-    orElse: () => configs.first,
-  );
+  for (final config in configs) {
+    if (config.id == activeId) {
+      return config;
+    }
+  }
+
+  return null;
 });
 
 final serverConnectionStateProvider = Provider<bool>((ref) {

lib/core/providers/app_startup_providers.dart

@@ -8,6 +8,7 @@ import '../../features/auth/providers/unified_auth_providers.dart';
 import '../services/navigation_service.dart';
 import '../models/conversation.dart';
 import '../services/background_streaming_handler.dart';
+import '../services/persistent_streaming_service.dart';
 import '../../features/onboarding/views/onboarding_sheet.dart';
 import '../../shared/theme/theme_extensions.dart';
 import '../services/connectivity_service.dart';
@@ -124,6 +125,10 @@ final appStartupFlowProvider = Provider<void>((ref) {
   // Keep Socket.IO connection alive in background within platform limits
   ref.watch(socketPersistenceProvider);
 
+  // Ensure persistent streaming uses the shared connectivity service
+  final connectivityService = ref.watch(connectivityServiceProvider);
+  PersistentStreamingService().attachConnectivityService(connectivityService);
+
   // Warm the conversations list in the background as soon as possible
   Future.microtask(() => _scheduleConversationWarmup(ref));