What happened:
When clicking the "Sign In" button on the login page multiple times, toast notifications appear one below the other in a continuous vertical stack.

What you expected to happen:
Error toast notifications should either Replace the previous toast with the new one, OR stack on top of each other in a more compact manner.
The current behavior creates a long vertical list of identical or similar error messages that clutters the UI and provides a poor user experience.

How to reproduce it (as minimally and precisely as possible):

1. Navigate to the Litmus login page (https://localhost:8185/login)
2. Enter credentials
3. Click the "Sign In" button multiple times rapidly
4. Observe that error toasts appear one below the next in a continuous vertical stack

Anything else we need to know?: