Refactor fullscreen grid UI; add serializer diagnostics/tests

- Replaced DxWindow with custom Bootstrap 5 fullscreen overlay for grid components, improving fullscreen UX and styling.
- Added new CSS for fullscreen overlay, header, and body; retained legacy DxWindow styles for compatibility.
- Introduced SignalRSerializerDiagnosticLog flag to control binary serializer diagnostics at runtime.
- Enabled diagnostics in DevAdminSignalRHub, FruitBankSignalRClient, and Program.cs based on the new flag.
- Updated OrderClientTests to use GetStockTakings(false).
- Added StockTakingSerializerTests for binary serialization/deserialization validation and debugging.

AyCode.Blazor.Components/Components/Grids/MgGridBase.cs

@@ -156,31 +156,39 @@ public abstract class MgGridBase<TSignalRDataSource, TDataItem, TId, TLoggerClie
         {
             if (_isStandaloneFullscreen && GridWrapper == null)
             {
-                // Standalone fullscreen mode - wrap in DxWindow
-                contentBuilder.OpenComponent<DxWindow>(0);
-                contentBuilder.AddAttribute(1, "Visible", true);
-                contentBuilder.AddAttribute(2, "VisibleChanged", EventCallback.Factory.Create<bool>(this, visible =>
+                // Standalone fullscreen mode - Bootstrap 5 fullscreen overlay
+                contentBuilder.OpenElement(0, "div");
+                contentBuilder.AddAttribute(1, "class", "mg-fullscreen-overlay");
+
+                // Header
+                contentBuilder.OpenElement(2, "div");
+                contentBuilder.AddAttribute(3, "class", "mg-fullscreen-header");
+
+                contentBuilder.OpenElement(4, "span");
+                contentBuilder.AddAttribute(5, "class", "mg-fullscreen-title");
+                contentBuilder.AddContent(6, Caption);
+                contentBuilder.CloseElement(); // span
+
+                contentBuilder.OpenElement(7, "button");
+                contentBuilder.AddAttribute(8, "type", "button");
+                contentBuilder.AddAttribute(9, "class", "btn-close btn-close-white");
+                contentBuilder.AddAttribute(10, "aria-label", "Close");
+                contentBuilder.AddAttribute(11, "onclick", EventCallback.Factory.Create<Microsoft.AspNetCore.Components.Web.MouseEventArgs>(this, () =>
                 {
-                    if (!visible)
-                    {
-                        _isStandaloneFullscreen = false;
-                        InvokeAsync(StateHasChanged);
-                    }
+                    _isStandaloneFullscreen = false;
+                    InvokeAsync(StateHasChanged);
                 }));
-                contentBuilder.AddAttribute(3, "ShowHeader", true);
-                contentBuilder.AddAttribute(4, "HeaderText", Caption);
-                contentBuilder.AddAttribute(5, "ShowCloseButton", true);
-                contentBuilder.AddAttribute(6, "CloseOnEscape", true);
-                contentBuilder.AddAttribute(7, "ShowFooter", false);
-                contentBuilder.AddAttribute(8, "Scrollable", true);
-                contentBuilder.AddAttribute(9, "Width", "100vw");
-                contentBuilder.AddAttribute(10, "Height", "100vh");
-                contentBuilder.AddAttribute(11, "CssClass", "mg-fullscreen-window");
-                contentBuilder.AddAttribute(12, "ChildContent", (RenderFragment)(windowBuilder =>
-                {
-                    base.BuildRenderTree(windowBuilder);
-                }));
-                contentBuilder.CloseComponent();
+                contentBuilder.CloseElement(); // button
+
+                contentBuilder.CloseElement(); // header div
+
+                // Body
+                contentBuilder.OpenElement(12, "div");
+                contentBuilder.AddAttribute(13, "class", "mg-fullscreen-body");
+                base.BuildRenderTree(contentBuilder);
+                contentBuilder.CloseElement(); // body div
+
+                contentBuilder.CloseElement(); // overlay div
             }
             else
             {

AyCode.Blazor.Components/Components/Grids/MgGridWithInfoPanel.razor

@@ -3,22 +3,15 @@
 <CascadingValue Value="this">
     @if (_isFullscreen)
     {
-        <DxWindow @bind-Visible="_isFullscreen"
-                  ShowHeader="true"
-                  HeaderText="@(_currentGrid?.Caption ?? "Grid")"
-                  ShowCloseButton="true"
-                  CloseOnEscape="true"
-                  ShowFooter="false"
-                  Scrollable="false"
-                  Width="100vw"
-                  Height="100vh"
-                  CssClass="mg-fullscreen-window">
-            <BodyTemplate>
-                <div class="mg-fullscreen-content">
-                    @RenderMainContent()
-                </div>
-            </BodyTemplate>
-        </DxWindow>
+        <div class="mg-fullscreen-overlay">
+            <div class="mg-fullscreen-header">
+                <span class="mg-fullscreen-title">@(_currentGrid?.Caption ?? "Grid")</span>
+                <button type="button" class="btn-close btn-close-white" aria-label="Close" @onclick="ExitFullscreen"></button>
+            </div>
+            <div class="mg-fullscreen-body">
+                @RenderMainContent()
+            </div>
+        </div>
     }
     else
     {

AyCode.Blazor.Components/wwwroot/css/mg-grid-info-panel.css

@@ -168,7 +168,62 @@
     background-color: var(--dxbl-bg-secondary);
 }
 
-/* Fullscreen window styling */
+/* Fullscreen overlay styling (Bootstrap 5 based) */
+.mg-fullscreen-overlay {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    width: 100vw;
+    height: 100vh;
+    z-index: 1050;
+    background-color: var(--dxbl-bg, #fff);
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+}
+
+.mg-fullscreen-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 0.75rem 1rem;
+    background-color: var(--dxbl-primary, #0d6efd);
+    color: #fff;
+    border-bottom: 1px solid var(--dxbl-border-color);
+    flex-shrink: 0;
+}
+
+.mg-fullscreen-title {
+    font-size: 1.1rem;
+    font-weight: 600;
+    margin: 0;
+}
+
+.mg-fullscreen-header .btn-close-white {
+    filter: brightness(0) invert(1);
+    opacity: 0.8;
+}
+
+.mg-fullscreen-header .btn-close-white:hover {
+    opacity: 1;
+}
+
+.mg-fullscreen-body {
+    flex: 1;
+    overflow: hidden;
+    display: flex;
+    flex-direction: column;
+}
+
+.mg-fullscreen-body .mg-grid-with-info-panel,
+.mg-fullscreen-body .dxbl-grid {
+    flex: 1;
+    height: 100%;
+}
+
+/* Legacy DxWindow styling (kept for backwards compatibility) */
 .mg-fullscreen-window {
     position: fixed !important;
     top: 0 !important;