feat(client): migrate SearchQueue.razor to ISearchApiClient

- Replace ISearchService injection with ISearchApiClient
- Add @using for JdeScoping.Core.ApiContracts and JdeScoping.Client.Extensions
- Update LoadQueueAsync to use result.Switch() pattern with ApiResult<T>
- Add _errorMessage field for error display
- Add RadzenAlert for error message display in UI

NEW/src/JdeScoping.Client/Pages/SearchQueue.razor

@@ -1,6 +1,8 @@
 @page "/search/queue"
 @attribute [Authorize]
-@inject ISearchService SearchService
+@using JdeScoping.Core.ApiContracts
+@using JdeScoping.Client.Extensions
+@inject ISearchApiClient SearchApi
 @inject IHubConnectionService HubConnection
 @implements IDisposable
 
@@ -30,6 +32,12 @@
 {
     <LoadingIndicator Message="Loading queue..." />
 }
+else if (!string.IsNullOrEmpty(_errorMessage))
+{
+    <RadzenAlert AlertStyle="AlertStyle.Danger" ShowIcon="true" Variant="Variant.Flat" class="rz-mb-4">
+        @_errorMessage
+    </RadzenAlert>
+}
 else
 {
     <RadzenDataGrid @ref="_grid" Data="@_searches" TItem="ClientSearchViewModel" AllowSorting="true" AllowPaging="true" PageSize="20"
@@ -65,6 +73,7 @@ else
     private List<ClientSearchViewModel> _searches = [];
     private RadzenDataGrid<ClientSearchViewModel>? _grid;
     private bool _isLoading = true;
+    private string? _errorMessage;
 
     private string _statusMessage = "";
     private string _statusUpdateDt = "";
@@ -78,9 +87,18 @@ else
     private async Task LoadQueueAsync()
     {
         _isLoading = true;
+        _errorMessage = null;
         try
         {
-            _searches = await SearchService.GetQueueAsync();
+            var result = await SearchApi.GetQueuedSearchesAsync();
+            result.Switch(
+                searches => { _searches = searches.ToClientList(); },
+                notFound => { _errorMessage = "Queue not found."; _searches = []; },
+                validation => { _errorMessage = string.Join("; ", validation.FieldErrors.SelectMany(e => e.Value)); },
+                unauthorized => { _errorMessage = "Session expired. Please login again."; },
+                forbidden => { _errorMessage = "Access denied."; },
+                error => { _errorMessage = error.Message; }
+            );
         }
         finally
         {