refactor(lib): drop step-graph helpers left in chart-geometry

Author: TheGreatAxios

src/lib/chart-geometry.ts

@@ -97,43 +97,3 @@ export function formatCompact(value: number): string {
   return value.toLocaleString();
 }
 
-/**
- * The step-graph's node layout runs along one axis at a time — a compact
- * preview reads left to right, an expanded trace pane reads top to bottom —
- * so the same edge-drawing and default-ordering helpers serve both instead of
- * a bespoke path builder per orientation.
- */
-export type StepGraphLayoutAxis = "horizontal" | "vertical";
-
-export type StepGraphEdgeEndpoint = { readonly from: string; readonly to: string };
-
-/** Every step connects to the next, in array order — the default edge set
- * when a caller has no real DAG dependency data to draw. */
-export function sequentialStepEdges(stepIds: readonly string[]): readonly StepGraphEdgeEndpoint[] {
-  const edges: StepGraphEdgeEndpoint[] = [];
-  for (let i = 0; i < stepIds.length - 1; i++) {
-    const from = stepIds[i];
-    const to = stepIds[i + 1];
-    if (from !== undefined && to !== undefined) edges.push({ from, to });
-  }
-  return edges;
-}
-
-/**
- * An SVG path for one node-to-node connector, straight and inset from both
- * node centers by `inset` so the line meets each node's edge rather than
- * running through its label. Returns `""` for a degenerate (near-zero-length)
- * connector — an arrowhead with nothing to point along would be a rendering
- * artifact, not information.
- */
-export function buildStepGraphEdgePath(from: Point, to: Point, inset: number): string {
-  const dx = to.x - from.x;
-  const dy = to.y - from.y;
-  const length = Math.hypot(dx, dy);
-  if (length <= inset * 2) return "";
-  const ux = dx / length;
-  const uy = dy / length;
-  const start = { x: from.x + ux * inset, y: from.y + uy * inset };
-  const end = { x: to.x - ux * inset, y: to.y - uy * inset };
-  return linePath([start, end]);
-}