Provided via SolidEChartProvider to set shared defaults across
a subtree, or directly on SolidEChart to configure a single instance.
Per-chart props always override provider values.
Properties marked as static in CreateChartOptions (locale,
devicePixelRatio, useDirtyRect, resizeDebounce) are only read at
init time - changes after mount have no effect.
Shared configuration for
SolidEChartinstances. All properties accept both static values and reactive accessors (signals).