Add a global New workspace picker (#1324)

* Add global New workspace project picker

* Clean up New workspace picker state

packages/app/src/utils/host-routes.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from "vitest";
 import {
   buildHostAgentDetailRoute,
+  buildHostNewWorkspaceRoute,
   buildHostRootRoute,
   buildHostWorkspaceOpenRoute,
   buildHostWorkspaceRoute,
@@ -120,6 +121,19 @@ describe("workspace route parsing", () => {
     );
   });
 
+  it("builds a global new workspace route without a source directory", () => {
+    expect(buildHostNewWorkspaceRoute("local")).toBe("/h/local/new");
+  });
+
+  it("builds a project shortcut new workspace route with initial project context", () => {
+    expect(
+      buildHostNewWorkspaceRoute("local", "/repo/project", {
+        displayName: "Project",
+        projectId: "project-1",
+      }),
+    ).toBe("/h/local/new?dir=%2Frepo%2Fproject&name=Project&projectId=project-1");
+  });
+
   it("round-trips URL-safe IDs through encode/decode", () => {
     const ids = ["1", "40", "164", "9999", "workspace-1", "opaque_id.v2~test"];
     for (const id of ids) {