feat: add File Explorer component to Project Session Detail Page

Introduced a new File Explorer accordion to the Project Session Detail Page, allowing users to browse, view, and manage files within their workspace directories. The component includes a directory selector with real-time Git status updates, enhancing user experience by providing visibility into file changes.

Changes:
- Added File Explorer accordion with directory selection functionality
- Integrated Git status badges for added and removed files
- Updated styling for improved layout consistency

This feature aims to streamline file management and version control within the application.

Author: Gkrumbach07