1.2.1: strokes scale with the layer (incl. inside SVG-asset placements)

- strokeCfg now defaults to strokeScaleEnabled:true so stroked rect /
  circle / text outlines grow proportionally when the layer is scaled
  (Konva default; previously hard-pinned to false).
- polygonConfig and clipPolygonConfig had inline stroke blocks that
  also forced strokeScaleEnabled:false. Flipped both to true so
  freeform / polygon outlines scale alongside the shape.
- SVG-asset placements use a dedicated svgChildConfig wrapper +
  pre-multiplied strokeWidth in svgStackForAsset: each child's stroke
  is bumped by the placement's geometric-mean scale and rendered with
  strokeScaleEnabled:false (Konva resets the ctx to identity before
  stroking) so the on-screen width lands at the right pixel count
  regardless of how Konva propagates parent transforms to nested
  stroke rendering. Konva-mounted tests cover outer-scale 1×, 3× and
  non-uniform 4×/1×.

UI chrome (transformer borders, vertex / tangent handles, hit-shape
outlines, animation-path ghosts, ghost-locked layer indicators) keeps
strokeScaleEnabled:false intentionally — those should stay at constant
pixel width regardless of zoom.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "ruwio",
   "private": true,
-  "version": "1.2.0",
+  "version": "1.2.1",
   "type": "module",
   "scripts": {
     "dev": "vite",