feat(scum): add map trajectory projection

platform_web/components/ScumMapTrajectoryPanel.test.ts

@@ -0,0 +1,9 @@
+import { describe, expect, it } from "vitest";
+
+import { trajectoryPath } from "./ScumMapTrajectoryPanel";
+
+describe("trajectoryPath", () => {
+  it("projects normalized map points into a stable SVG path", () => {
+    expect(trajectoryPath([{ mapX: 0, mapY: 0 }, { mapX: 500, mapY: 250 }, { mapX: 1000, mapY: 1000 }])).toBe("M0,1000 L500,750 L1000,0");
+  });
+});