fix(ui): preserve construction tools and dashed feedback (#600)

Construction (X) keeps the active sketch tool, its picked points and inline values while switching line type, and drawing previews and hover show the same dashed pattern as committed construction and centre lines. Fixes #584 and #581.

Co-authored-by: lillith <[email protected]>

ROADMAP.md

@@ -61,6 +61,11 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 
 ## Dimensioning and error reporting
 
+- 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
+  committed geometry; centerlines retain their dash-dot pattern.
+
 - Point has a default Sketch CREATE toolbar button alongside the existing drawing tools.
   Saved custom layouts are preserved; Reset Toolbar restores the default Point button.
 - Construction planes cannot take an origin-plane name (XY, XZ, YZ, Top, Front, Right). Plane