Add missing step and layer properties to Arrow type

lib/setStepOfAllObjects.ts

@@ -34,6 +34,11 @@ export function setStepOfAllObjects(
       circle.step = step
     }
   }
+  if (graphics.arrows) {
+    for (const arrow of graphics.arrows) {
+      arrow.step = step
+    }
+  }
   if (graphics.texts) {
     for (const text of graphics.texts) {
       text.step = step

lib/types.ts

@@ -68,6 +68,8 @@ export interface Arrow {
   color?: string
   label?: string
   inlineLabel?: string
+  layer?: string
+  step?: number
 }
 
 export type NinePointAnchor =

tests/setStepOfAllObjects.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect, test } from "bun:test"
+import { setStepOfAllObjects } from "../lib/setStepOfAllObjects"
+import type { GraphicsObject } from "../lib/types"
+
+describe("setStepOfAllObjects", () => {
+  test("sets step on all element types including arrows", () => {
+    const graphics: GraphicsObject = {
+      points: [{ x: 0, y: 0 }],
+      lines: [
+        {
+          points: [
+            { x: 0, y: 0 },
+            { x: 1, y: 1 },
+          ],
+        },
+      ],
+      infiniteLines: [
+        {
+          origin: { x: 0, y: 0 },
+          directionVector: { x: 1, y: 0 },
+        },
+      ],
+      rects: [{ center: { x: 0, y: 0 }, width: 1, height: 1 }],
+      circles: [{ center: { x: 0, y: 0 }, radius: 1 }],
+      polygons: [
+        {
+          points: [
+            { x: 0, y: 0 },
+            { x: 1, y: 0 },
+            { x: 0.5, y: 1 },
+          ],
+        },
+      ],
+      arrows: [
+        {
+          start: { x: 0, y: 0 },
+          end: { x: 5, y: 5 },
+          label: "arrow1",
+        },
+        {
+          start: { x: 1, y: 1 },
+          end: { x: 3, y: 3 },
+          doubleSided: true,
+        },
+      ],
+      texts: [{ x: 0, y: 0, text: "hello" }],
+    }
+
+    setStepOfAllObjects(graphics, 3)
+
+    expect(graphics.points![0].step).toBe(3)
+    expect(graphics.lines![0].step).toBe(3)
+    expect(graphics.infiniteLines![0].step).toBe(3)
+    expect(graphics.rects![0].step).toBe(3)
+    expect(graphics.circles![0].step).toBe(3)
+    expect(graphics.polygons![0].step).toBe(3)
+    expect(graphics.arrows![0].step).toBe(3)
+    expect(graphics.arrows![1].step).toBe(3)
+    expect(graphics.texts![0].step).toBe(3)
+  })
+
+  test("handles empty graphics object", () => {
+    const graphics: GraphicsObject = {}
+    const result = setStepOfAllObjects(graphics, 1)
+    expect(result).toEqual({})
+  })
+})