chore: scaffold PySide6 application

src/app/widgets/__init__.py

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+

src/app/widgets/export_panel.py

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+from PySide6.QtWidgets import QWidget
+
+
+class ExportPanel(QWidget):
+    pass

src/app/widgets/image_canvas.py

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+from PySide6.QtWidgets import QGraphicsScene, QGraphicsView
+
+
+class ImageCanvas(QGraphicsView):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setScene(QGraphicsScene(self))

src/app/widgets/image_list_panel.py

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+from PySide6.QtWidgets import QWidget
+
+
+class ImageListPanel(QWidget):
+    pass

src/app/widgets/template_panel.py

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+from PySide6.QtWidgets import QWidget
+
+
+class TemplatePanel(QWidget):
+    pass

src/app/widgets/transform_panel.py

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+from PySide6.QtWidgets import QWidget
+
+
+class TransformPanel(QWidget):
+    pass