fix(ui): preview actual polygon outlines while drawing (#583)

Inscribed, circumscribed and edge polygon tools preview their actual outline (side count and orientation) while drawing, with the current line type, instead of only the support circle. Preview work is bounded. Fixes #520.

Co-authored-by: lillith <35337584+0xlillith@users.noreply.github.com>

ROADMAP.md

@@ -61,6 +61,8 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 
 ## Dimensioning and error reporting
 
+- Inscribed, circumscribed and edge polygon tools preview their actual outline before
+  placement, including orientation and the selected side count.
 - Construction (X) preserves the active sketch drawing tool, picked anchors and inline
   dimension values, so line type can change while a shape is in progress.
 - Planar sketch construction previews and hover feedback keep the same dashed pattern as