test: add AI recommendations fallback tests

Cover repository and view model fallback behavior and fix load state handling for 503 fallback responses.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/view_models/ai_recommendations_view_model.dart

@@ -72,6 +72,8 @@ class AiRecommendationsViewModel with ChangeNotifier {
 
     final result = await _companyAiRepository.getRecommendations();
 
+    var loadedSuccessfully = false;
+
     switch (result) {
       case Ok<RecommendResponse>():
         _items = result.value.data ?? const [];
@@ -79,28 +81,32 @@ class AiRecommendationsViewModel with ChangeNotifier {
         if (_items.isEmpty) {
           _stillLearning = _onboardingWasRecent();
         }
+        loadedSuccessfully = true;
       case Error<RecommendResponse>():
-        await _handleError(result.error);
+        loadedSuccessfully = await _handleError(result.error);
     }
 
     _isLoading = false;
-    _hasLoaded = true;
+    _hasLoaded = loadedSuccessfully;
     notifyListeners();
   }
 
   /// Pull-to-refresh: always re-fetches.
   Future<void> refresh() => loadRecommendations();
 
-  Future<void> _handleError(Exception error) async {
+  Future<bool> _handleError(Exception error) async {
     // 503 means the AI service isn't configured/available — fall back to the
-    // legacy recommend list rather than showing an error.
+    // legacy recommend list rather than showing an error. NetworkManager only
+    // exposes this status when Dio received an HTTP response; connection and
+    // timeout failures have no reliable status code and should remain retryable.
     if (error is AppException && error.statusCode == 503) {
       await _loadFallback();
-      return;
+      return _errorMessage == null;
     }
     _items = const [];
     _fallbackTenders = const [];
     _errorMessage = error.toString();
+    return false;
   }
 
   Future<void> _loadFallback() async {