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layerchart minor

feat: Unified component tree for Canvas rendering with proper Group transform scoping. Fixes #662

  • New registerComponentNode({ name, kind, canvasRender }) API replaces both registerCanvasComponent and the InsideCompositeMark boolean context with a single unified component tree.
  • Canvas rendering now walks the tree recursively with proper save()/restore() scoping, fixing Group transforms (translate, opacity) leaking to sibling components instead of only affecting children.
  • Composite marks (Area, Threshold, Hull, Labels, Grid) register as 'composite-mark' nodes, automatically preventing child marks from registering with the chart without manual _skipRegistration props.
  • Removed retainState and name from ComponentRender type — Group's transform scoping is handled by tree position, and component names live on the tree node.