- **Navigation Updates:**
- Added `AppScreen.Billing` route for participant billing linked to an event and tournament.
- **UI Additions:**
- Introduced `BillingScreen` and `BillingViewModel` for participant account management and manual transactions.
- Updated `TurnierAbrechnungTab` to include `BillingScreen` and enable account interaction.
- **Turnier Enhancements:**
- Enhanced `NennungenTabContent` to support navigation to billing via a new interaction.
- Added billing feature as a dependency to `turnier-feature`.
- **Billing Domain:**
- Extended `Money` to include subtraction operation and improved formatting for negative amounts.
- Added DTOs (`TeilnehmerKontoDto`, `BuchungDto`, `BuchungRequest`) for seamless data exchange with backend.
- **Test Improvements:**
- Updated `PreviewTurnierAbrechnungTab` to include interactive billing placeholder.
- **Misc Updates:**
- Enhanced breadcrumb navigation for billing in `DesktopMainLayout` for better user experience.