Legend integration (simplified charts)

[techniq]

• Support show/hiding series when values are clicked
  • Examples
    • https://echarts.apache.org/examples/en/editor.html?c=bar-label-rotation
    • https://www.amcharts.com/demos/clustered-column-chart/
    • https://www.amcharts.com/demos/donut-chart/
    • https://www.amcharts.com/demos/grouped-countries-map/
• Support hovering legend to show values
  • https://observablehq.com/@joewdavies/map-legend-as-a-bar-chart
• Support showing where value falls within legend on hover
  • Examples
    • https://www.amcharts.com/demos/us-heat-map/
    • https://www.highcharts.com/demo/maps/us-counties
    • https://echarts.apache.org/examples/en/editor.html?c=map-usa-projection
    • https://echarts.apache.org/examples/en/editor.html?c=custom-hexbin

See discussion

[techniq]

Integrated for simplified charts (AreaChart, BarChart, LineChart, PieChart, ScatterChart) in 0.75.0 via #329.
See bluesky post with video examples: https://bsky.app/profile/techniq.dev/post/3lgiizblles2n

Once GeoChart simplified chart is implemented, we will cover the geo use cases