v0.2.4

Full Changelog: v0.2.3...v0.2.4

• Layout authoring is now a single unified Layout node, replacing the separate LayoutGenerator and SplineLayout nodes. One node holds a list of items, each independently an ellipse, rectangle, line, or freehand-drawn spline.
• Layout nodes have a dedicated edit view: double-click the node to open a full-area tab with a 2D editing canvas on the left and a 3D preview on the right.
• 2D canvas editor for Layout items
  • Tool dropdown picks ellipse, rectangle, line, or draw (freehand spline)
  • Drag to create a shape; Shift snaps line angles to 45-degree increments and constrains ellipses / rectangles to equal radii
  • Press a shape's body to select and drag it in one motion
  • Corner-resize handles anchor the opposite corner so the shape grows from where you grab; hold Shift for center-fixed scaling
  • Grid divisions match the map's dimensions, so a 4x4 map shows 4 main squares per axis with subtler sub-cells inside each
• Layout 3D preview matches the Sculpt viewport in rendering quality and camera controls (orbit, pan, zoom)
• Layout items can be mirrored across X, mirrored across both axes, or rotated 90 degrees from a single authored shape; mirror modes choose between replace and average blending for overlapping pixels
• Demo .barproj projects under examples/spline-layout-demos/ and examples/symmetric-layout-demos/ showcase the new node

Bug fixes:

• Slider edits in the Layout sidebar persist while dragging the bar (previously the value would visually snap back until release)