feat: implement dynamic knowledge graph updates and state management services

src/NexusReader.UI.Shared/Components/Molecules/AiAssistantBubble.razor

@@ -31,13 +31,10 @@
     [Parameter] public List<string> Actions { get; set; } = new();
     [Parameter] public EventCallback<string> OnActionTriggered { get; set; }
 
-    private bool _isQuizMode = false;
-
     private async Task HandleActionClick(string action)
     {
         if (action.Contains("quiz", StringComparison.OrdinalIgnoreCase))
         {
-            _isQuizMode = true;
             QuizState.RequestQuiz(ContextBlockId);
         }