Add in-app notifications to Web applications

Add toast-style in-app notifications to Objo Web applications so developers can give users brief, non-modal feedback without building custom banners or interrupting the workflow with a dialog. Notifications may represent information, success, warning, or error states; include an optional title and system symbol; appear in a responsive stack at a configurable position; show remaining time; pause while being inspected; and be dismissed automatically or manually.

In-app notifications require no browser permission and remain visually consistent with the application's active Objo theme. They are distinct from native browser notifications, whose appearance and delivery are controlled by the browser or operating system.