Fix preview visibility initialization in Canvas

Replaces setPreviewVisibility(false) with direct assignment to previewVisible in Canvas and Canvas.ts. Adds initialization of preview state based on widget value in CanvasView and CanvasView.ts to ensure correct preview visibility on widget creation.

src/Canvas.ts

@@ -132,7 +132,7 @@ export class Canvas {
             viewport: this.viewport
         });
 
-        this.setPreviewVisibility(false);
+        this.previewVisible = false;
     }
 
 

src/CanvasView.ts

@@ -730,6 +730,11 @@ async function createCanvasWidget(node: ComfyNode, widget: any, app: ComfyApp):
                 node.setDirtyCanvas(true, true);
             }
         };
+
+        // Inicjalizuj stan preview na podstawie aktualnej wartości widget'u
+        if (canvas && canvas.setPreviewVisibility) {
+            canvas.setPreviewVisibility(showPreviewWidget.value);
+        }
     }
 
     return {