Implement Toast Notification System for User Feedback

### **Description:**
Add a toast notification system to the website to provide feedback on user actions (e.g., successful form submission, error handling, or item deletion).

**Requirements:**

- Create a reusable Toast component (e.g., in /components/toast).
- Implement toast variants: success, error, info, and warning.
- Implement auto-dismiss functionality (e.g., disappear after 3-5 seconds).
- Ensure toast notifications appear in the top-right or bottom-right corner.
- Add basic styling/animations for appearing and disappearing.
- (Optional) Add a close button to the toast.

Deliverables:

- A functional toast container and component.
- Using toast in different parts of the application.

Start by reviewing the existing website structure and the /components/toast location mentioned in the issue. Define a reusable Toast component and container with success, error, info, and warning variants, positioning, auto-dismiss behavior, and basic animations. Done means the container works and toast notifications are used in different parts of the application.

Written by the indexing model from the issue text.