chore: add diagnostic console logging to identity service and UI components

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

@@ -85,6 +85,14 @@
 
     private bool _isSyncing = false;
 
+    protected override void OnAfterRender(bool firstRender)
+    {
+        if (firstRender)
+        {
+            Console.WriteLine($"[MainHubLayout] Rendered. IsBrowser: {System.OperatingSystem.IsBrowser()}");
+        }
+    }
+
     protected override async Task OnInitializedAsync()
     {
         if (_isSyncing) return;

src/NexusReader.UI.Shared/Pages/Account/Profile.razor

@@ -110,7 +110,9 @@
 
     protected override async Task OnInitializedAsync()
     {
+        Console.WriteLine("[Profile] Initializing...");
         _profile = await IdentityService.GetProfileAsync();
+        Console.WriteLine($"[Profile] Profile loaded: {_profile?.Email ?? "NULL"}");
         StateHasChanged();
     }
 

src/NexusReader.UI.Shared/Services/IdentityService.cs

@@ -121,14 +121,17 @@ public class IdentityService : IIdentityService
     {
         if (_cachedProfile != null) 
         {
+            Console.WriteLine("[IdentityService] Returning cached profile.");
             return _cachedProfile;
         }
         
         if (_profileTask != null) 
         {
+            Console.WriteLine("[IdentityService] Awaiting existing profile task...");
             return await _profileTask;
         }
 
+        Console.WriteLine("[IdentityService] Starting new profile fetch task...");
         _profileTask = GetProfileInternalAsync();
         return await _profileTask;
     }
@@ -139,11 +142,13 @@ public class IdentityService : IIdentityService
     {
         if (!System.OperatingSystem.IsBrowser()) 
         {
+            Console.WriteLine("[IdentityService] Skipping profile fetch: Not in browser.");
             return null;
         }
 
         if (DateTime.UtcNow - _lastFetchAttempt < TimeSpan.FromSeconds(5))
         {
+            Console.WriteLine("[IdentityService] Skipping profile fetch: Throttled.");
             return null;
         }
 
@@ -151,18 +156,23 @@ public class IdentityService : IIdentityService
         try
         {
             var response = await _httpClient.GetAsync("identity/profile");
+            Console.WriteLine($"[IdentityService] Profile response: {response.StatusCode}");
             
             if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
             {
+                Console.WriteLine("[IdentityService] Unauthorized. Logging out...");
                 await LogoutAsync();
                 return null;
             }
 
             if (response.IsSuccessStatusCode)
             {
+                var content = await response.Content.ReadAsStringAsync();
+                Console.WriteLine($"[IdentityService] Raw content: {content}");
                 var profile = await response.Content.ReadFromJsonAsync<UserProfile>();
                 if (profile != null)
                 {
+                    Console.WriteLine($"[IdentityService] Profile fetched: {profile.Email}");
                     _cachedProfile = profile;
                     await _storageService.SaveSecureString("nexus_user_email", profile.Email);
                     await _storageService.SaveSecureString("nexus_user_tenant", profile.TenantId.ToString());
@@ -173,8 +183,9 @@ public class IdentityService : IIdentityService
             
             return null;
         }
-        catch
+        catch (Exception ex)
         {
+            Console.WriteLine($"[IdentityService] ERROR: {ex.Message}");
             return null;
         }
         finally