refactor: consolidate project structure by migrating authentication, identity, and shared UI components while removing legacy Web Client files.

src/NexusReader.UI.Shared/Layout/MainLayout.razor

@@ -7,6 +7,8 @@
 @inject IFocusModeService FocusMode
 @inject IQuizStateService QuizService
 @inject IJSRuntime JS
+@inject IIdentityService IdentityService
+@inject NavigationManager NavigationManager
 @implements IDisposable
 
 <div class="app-container @_platformClass @(FocusMode.IsFocusModeActive ? "focus-mode-active" : "")">
@@ -23,8 +25,23 @@
         <IntelligenceToolbar />
         <div class="intelligence-content">
             <div class="intelligence-header">
-                <NexusIcon Name="robot" Size="20" Class="@($"neon-glow {(QuizService.HasNewQuiz ? "quiz-available" : "")}")" />
-                <span>Asystent AI i Interaktywna Mapa</span>
+                <div class="ai-title">
+                    <NexusIcon Name="robot" Size="20" Class="@($"neon-glow {(QuizService.HasNewQuiz ? "quiz-available" : "")}")" />
+                    <span>Asystent AI</span>
+                </div>
+                
+                <AuthorizeView>
+                    <Authorized>
+                        <div class="user-profile">
+                            <span class="user-email">@context.User.Identity?.Name</span>
+                            <button class="logout-btn" @onclick="HandleLogout">Logout</button>
+                        </div>
+                    </Authorized>
+                    <NotAuthorized>
+                        <a href="/account/login" class="login-link">Login</a>
+                    </NotAuthorized>
+                </AuthorizeView>
+
                 <button class="close-btn">×</button>
             </div>
             
@@ -61,6 +78,12 @@
         }
     }
 
+    private async Task HandleLogout()
+    {
+        await IdentityService.LogoutAsync();
+        NavigationManager.NavigateTo("/", true);
+    }
+
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
         if (firstRender)