fix: address widget review feedback

packages/widgets/src/tracearr/component.spec.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+
+import { getAdvancedColumnWidth } from "./component";
+
+describe("Tracearr advanced layout", () => {
+  it("subtracts grid padding and the inter-column gap", () => {
+    expect(getAdvancedColumnWidth(800, true)).toBe(376);
+    expect(getAdvancedColumnWidth(801, true)).toBe(376.5);
+  });
+
+  it("subtracts only grid padding in a single-column layout", () => {
+    expect(getAdvancedColumnWidth(799, false)).toBe(767);
+  });
+});