Curvature View & Auto Smooth / Harmonization Tool

[Honor]

I would like to suggest two features that would significantly enhance VectorStyler for logotype and lettering workflows:

1. Curvature View (Live Curvature Visualization)
   A real-time curvature overlay for Bézier curves to detect curvature spikes, G2 discontinuities, and flow inconsistencies.
2. Auto Smooth / Harmonization Tool
   An intelligent smoothing function that redistributes curvature across selected nodes or segments, improving G2 continuity and preserving overall curve flow during local edits. For reference, tools like Glyphs (SpeedPunk curvature visualization) demonstrate how real-time curvature feedback can significantly improve precision in curve refinement workflows.

These features would make VectorStyler a much stronger precision tool for logo and typographic shape construction.

[VectorStyler]

@Honor I will add this to the backlog for 1.4, some clarifications might be needed later