Add a Single Global Footer to Avoid Duplicate Page-Level Footers

### Is your feature request related to a problem?

- [x] Yes, it is related to a problem

### Describe the feature you'd like

Problem:
Currently, footers are defined at page level, which can lead to duplicate footers
or inconsistent behavior across routes.

Proposed solution:
Introduce a single global Footer component rendered at the app layout level
(App.tsx), so all pages share the same footer.

Benefits:
- Consistent UI across the platform
- Avoids duplicate footers
- Easier maintenance and updates

Scope:
Frontend only

### Record

- [x] I agree to follow this project's Code of Conduct
- [x] I want to work on implementing this feature