LayerChart 2.0

[techniq]

The goal of this issue is to track the major plans for LayerChart 2.0

• [x] Migrate to Tailwind 4 (#388)-
• [x] Migrate to Svelte 5 features ($state/$derived runes, snippets, etc) (related)
• [x] Remove LayerCake dependency (related)
  • This will enable better integration with various contexts and typing
  • Svg, Canavs, and Html layers have already become much different from LayerCake
    • Tight integration with LayerChart primitives (especially canvas including registration and pointer events)
    • TransformContext integration
  • Only remaining usage is the main Chart/LayerCake to setup the chart context, calculate domains/ranges, and layout
• [ ] Remaining 2.0 milestone issues/improvements