feat(primitives): sphere,cylinder,cone,pill

Added tools:

  - Sphere: center point, radius point, circle resolution controls tessellation.
  - Cylinder: base center, radius point, height point; axis is h - c, base plane is normal to that axis.
  - Cone: same 3-point workflow as cylinder, apex at height point.
  - Pill: same 3-point workflow as cylinder, capsule body between c and h with hemispherical caps.

  Wiring included:

  - new ToolIds
  - new PrimitiveTools.kt
  - registered tools in Main.kt
  - new Primitives toolbar in SketchUiOverlay.kt
  - mapped icons: sphere, cylinder, cone, pill
  - toolbar layout version bumped so the new toolbar gets placed cleanly

Primitive tools now show 3D wireframe feedback while picking:

  - sphere previews latitude/longitude wireframe after center + radius hover
  - cylinder previews bottom/top rings and vertical edges
  - cone previews base ring and side edges
  - pill previews capsule rings and longitudinal edges

  Toolbar commands are now registered for every built-in toolbar:

  - View> Toolbars> Show ...
  - View> Toolbars> Hide ...

  This includes Actions, Point Construction, Modification, Entity Construction, Rendering, Architecture, Camera, Modification 2, Voxel, HVAC, Mech, Primitives, and In-tool Operators.

fix:
The Primitives toolbar was being created and stored in builtInToolbars, but it was missing from the buildStandardToolbars() return list. That means it was never added to the stage, so:

  - primitive tool commands could still activate the tools
  - show/hide commands found the toolbar object
  - but nothing appeared, because the toolbar actor was not in the scene graph

  Fixed in core/src/main/kotlin/com/github/alfu32/sketch/ui/SketchUiOverlay.kt:1689:

  - added primitives to the standard toolbar actor list
  - made setBuiltInToolbarVisible() self-heal by adding the toolbar to the stage if it is detached

Author: alferio

core/src/main/kotlin/com/github/alfu32/sketch/tools/PrimitiveTools.kt

@@ -127,14 +127,14 @@ class SpherePrimitiveTool(
                         val c = upper[next]
                         val d = upper[i]
                         if (stack == 0) {
-                            group.faceStore.addTriangle(a, c, d, faceColor)
+                            group.faceStore.addTriangle(a, d, c, faceColor)
                             faces++
                         } else if (stack == stacks - 1) {
-                            group.faceStore.addTriangle(a, b, d, faceColor)
+                            group.faceStore.addTriangle(a, d, b, faceColor)
                             faces++
                         } else {
-                            group.faceStore.addTriangle(a, b, c, faceColor)
-                            group.faceStore.addTriangle(a, c, d, faceColor)
+                            group.faceStore.addTriangle(a, c, b, faceColor)
+                            group.faceStore.addTriangle(a, d, c, faceColor)
                             faces += 2
                         }
                         edges += addPrimitiveSegment(group, a, b)