feat(desktop): support multiple windows

Closes #250

packages/desktop/src/pending-open-project-store.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+
+import { PendingOpenProjectStore } from "./pending-open-project-store";
+
+describe("PendingOpenProjectStore", () => {
+  it("stores pending paths per window and consumes them independently", () => {
+    const store = new PendingOpenProjectStore();
+
+    store.set(101, "/tmp/project-a");
+    store.set(202, "/tmp/project-b");
+
+    expect(store.take(101)).toBe("/tmp/project-a");
+    expect(store.take(202)).toBe("/tmp/project-b");
+  });
+
+  it("clears a pending path after it is consumed", () => {
+    const store = new PendingOpenProjectStore();
+
+    store.set(101, "/tmp/project-a");
+
+    expect(store.take(101)).toBe("/tmp/project-a");
+    expect(store.take(101)).toBeNull();
+  });
+
+  it("ignores empty and whitespace-only paths", () => {
+    const store = new PendingOpenProjectStore();
+
+    store.set(101, "   ");
+
+    expect(store.take(101)).toBeNull();
+  });
+});