Summary

Add a "Scaling" field to the Stroke node that allows users to toggle whether strokes should scale with shape transformations or maintain a constant visual width.

Motivation

Currently, strokes always scale with shape transformations. This feature gives users control over stroke behavior, which is a common requirement in vector graphics applications. Users can choose between:

• Scale with Shape: Strokes scale proportionally with transformations (default)
• Non-Scaling: Strokes maintain constant visual width regardless of transformations

Implementation Details

• Add StrokeScaling enum with ScaleWithShape and NonScaling options
• Add new "Scaling" parameter to the Stroke node
• Update document migration to handle the new parameter
• Fix migration bug that caused index out of bounds error when upgrading existing documents