Fix matting: refresh image after background removal

Fixed an issue where images were not immediately refreshed after background removal (matting). Now, the canvas updates instantly when the background is removed, ensuring correct display without requiring manual scaling or other actions.

js/CanvasView.js

@@ -430,6 +430,8 @@ async function createCanvasWidget(node, widget, app) {
                             delete newLayer.imageId;
                             canvas.layers[selectedLayerIndex] = newLayer;
                             canvas.canvasSelection.updateSelection([newLayer]);
+                            // Invalidate processed image cache when layer image changes (matting)
+                            canvas.canvasLayers.invalidateProcessedImageCache(newLayer.id);
                             canvas.render();
                             canvas.saveState();
                             showSuccessNotification("Background removed successfully!");