Fix PyQT Error #756
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Fix PyQT Error #756
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Fixed PyQt and PyQtGraph compatibility issues:
QtGui.QApplication -> QtWidgets.QApplication
Error: AttributeError: module 'pyqtgraph.Qt.QtGui' has no attribute 'QApplication'
Fix: Updated import to use QtWidgets which is the correct module for QApplication in newer Qt versions
pg.GraphicsWindow -> pg.GraphicsLayoutWidget
Error: AttributeError: module 'pyqtgraph' has no attribute 'GraphicsWindow'
Fix: GraphicsWindow was deprecated and replaced with GraphicsLayoutWidget in newer PyQtGraph versions
Added "show=True" parameter
Fix: Explicitly set window visibility when creating GraphicsLayoutWidget