Refactor SbDialog component to enhance OnCloseButtonClick behavior, ensuring it runs before the standard close flow while still invoking OpenChanged. Update JavaScript functions to prevent closing when already closed. Improve tests to validate new close behavior and synchronization.

tests/Components/Overlays/SbDialogTests.cs

@@ -256,26 +256,48 @@ public class SbDialogTests : BunitContext
     }
 
     [Fact]
-    public async Task OnCloseButtonClickTakesPrecedenceWhenSet()
+    public async Task NativeCloseEventInvokesOpenChangedToFalse()
     {
-        // Arrange - when OnCloseButtonClick is set, it runs instead of default close
+        // Arrange
+        var openChangedValue = true;
+        SbDialogCloseReason? closeReason = null;
+        var cut = RenderDialog(p => p
+            .Add(x => x.Open, true)
+            .Add(x => x.Title, "Dialog")
+            .Add(x => x.OpenChanged, EventCallback.Factory.Create<bool>(this, v => openChangedValue = v))
+            .Add(x => x.OnClose, EventCallback.Factory.Create<SbDialogCloseReason>(this, r => closeReason = r)));
+
+        // Act
+        var dialog = cut.Find("dialog.sb-dialog");
+        await cut.InvokeAsync(() => dialog.TriggerEventAsync("onclose", EventArgs.Empty));
+
+        // Assert
+        Assert.False(openChangedValue);
+        Assert.Equal(SbDialogCloseReason.CloseButton, closeReason);
+    }
+
+    [Fact]
+    public async Task OnCloseButtonClickRunsBeforeStandardCloseWhenSet()
+    {
+        // Arrange - custom close hooks should not bypass OpenChanged synchronization
         var closeBtnClicked = false;
+        var openChangedValue = true;
         SbDialogCloseReason? closeReason = null;
         var cut = RenderDialog(p => p
             .Add(x => x.Open, true)
             .Add(x => x.Title, "Dialog")
             .Add(x => x.OnCloseButtonClick, EventCallback.Factory.Create(this, () => closeBtnClicked = true))
+            .Add(x => x.OpenChanged, EventCallback.Factory.Create<bool>(this, v => openChangedValue = v))
             .Add(x => x.OnClose, EventCallback.Factory.Create<SbDialogCloseReason>(this, r => closeReason = r)));
 
         // Act
         var closeBtn = cut.Find(".sb-dialog__close-btn");
         await cut.InvokeAsync(() => closeBtn.Click());
 
-        // Assert - OnCloseButtonClick was invoked; parent typically handles close, so OnClose may not fire
+        // Assert
         Assert.True(closeBtnClicked);
-        // With OnCloseButtonClick delegate, CloseAsync is NOT called (see HandleCloseButtonClick logic)
-        // so OnClose and OpenChanged are NOT invoked by default
-        Assert.Null(closeReason);
+        Assert.Equal(SbDialogCloseReason.CloseButton, closeReason);
+        Assert.False(openChangedValue);
     }
 
     [Fact]