Module chart 

Chart view widget: sidebar (type, x/y columns, options) and chart area.

Enums

ChartRenderData

Functions

render_chart_view

Renders the chart view: title, left sidebar (chart type, x/y inputs+lists, checkboxes), and chart area (no border). When only x is selected (no chart data), x_bounds may be Some((min, max)) from the x column so the x axis shows the proper range.