@pond-ts/charts API Reference
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    Type Alias CreateSpec

    CreateSpec:
        | { at: number; kind: "marker" }
        | { axis: string; kind: "baseline"; value: number }
        | { from: number; kind: "region"; to: number }

    What a completed create gesture reports to ContainerFrame.onCreate — the new mark's kind + position in axis units (+ the y-axis id for a baseline). (Which row a mark lands on is the consumer's call for now; multi-row routing is a follow-up.)