- Introduced comprehensive management screens for horses, riders, clubs, and officials.
- Integrated reusable `ManagementTableScreen` component for standardized layouts and operations.
- Added back-navigation support in `DesktopNavigationPort` with a stack-based implementation.
- Refined `DesktopMainLayout` with enhanced routing and dynamic placeholders for in-development screens.
- Updated roadmap to reflect completion of Phase 7: "Zentrale Verwaltung".
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>
