Toast colours and persistence

All toasts in the Storybook example appear to be persistent (must be manually dismissed) and do not use the typical colours (e.g., blue for info, yellow for warning).

<img width="846" height="466" alt="Image" src="https://github.com/user-attachments/assets/98166419-a661-4cab-b6f4-a8b0af6509f2" />