List the last visited workspace first in the rail

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/utils/order-rail-workspaces.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, test } from "bun:test";
+import type { WorkspaceWithActivity } from "@/src/types";
+import orderRailWorkspaces from "./order-rail-workspaces";
+
+const workspaces = [1, 2, 3, 4].map((id) => ({ id, name: `W${id}` }) as WorkspaceWithActivity);
+
+function ids(list: WorkspaceWithActivity[]) {
+    return list.map((workspace) => workspace.id);
+}
+
+describe("orderRailWorkspaces", () => {
+    test("the last visited workspace leads, the rest keep their order", () => {
+        expect(ids(orderRailWorkspaces({ workspaces, first_id: 3 }))).toEqual([3, 1, 2, 4]);
+    });
+
+    test("unchanged without one, or when it isn't listed", () => {
+        expect(ids(orderRailWorkspaces({ workspaces }))).toEqual([1, 2, 3, 4]);
+        expect(ids(orderRailWorkspaces({ workspaces, first_id: null }))).toEqual([1, 2, 3, 4]);
+        expect(ids(orderRailWorkspaces({ workspaces, first_id: 9 }))).toEqual([1, 2, 3, 4]);
+    });
+});