[Feature Request]: Apply EnAccess branding to Agent App

### Preflight Checklist

- [x] I have read the [Contributing Guidelines](https://github.com/EnAccess/micropowermanager-agent-app/blob/main/CONTRIBUTING.md) for this project, if it exists.
- [x] I agree to follow the [Code of Conduct](https://github.com/EnAccess/micropowermanager-agent-app/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [x] I have searched the [issue tracker](https://github.com/EnAccess/micropowermanager-agent-app/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

Currently, MPM Agent app uses legacy branding.

### Proposed Solution

Please follow the EnAccess MPM branding as per style guide: https://micropowermanager.io/development/frontend.html#mpm-brand-guidelines

### Alternatives Considered

N/A

### Additional Information

_No response_