feat(desktop): support multiple windows

Closes #250

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

@@ -0,0 +1,32 @@
+export class PendingOpenProjectStore {
+  private readonly pendingPathByWebContentsId = new Map<number, string>();
+
+  set(webContentsId: number, projectPath: string | null | undefined): void {
+    const normalizedPath = this.normalizeProjectPath(projectPath);
+    if (!normalizedPath) {
+      this.pendingPathByWebContentsId.delete(webContentsId);
+      return;
+    }
+
+    this.pendingPathByWebContentsId.set(webContentsId, normalizedPath);
+  }
+
+  take(webContentsId: number): string | null {
+    const projectPath = this.pendingPathByWebContentsId.get(webContentsId) ?? null;
+    this.pendingPathByWebContentsId.delete(webContentsId);
+    return projectPath;
+  }
+
+  delete(webContentsId: number): void {
+    this.pendingPathByWebContentsId.delete(webContentsId);
+  }
+
+  private normalizeProjectPath(projectPath: string | null | undefined): string | null {
+    if (typeof projectPath !== "string") {
+      return null;
+    }
+
+    const trimmedPath = projectPath.trim();
+    return trimmedPath ? trimmedPath : null;
+  }
+}