- Enabled web-to-backend nominations with `MailController` and REST endpoint (`/api/mail/nennung`).
- Added `NennungRemoteRepository` for frontend API integration using Ktor.
- Linked `WebMainScreen` to backend API for nomination handling and confirmation display.
- Implemented automated confirmation emails for received nominations.
- Updated `MASTER_ROADMAP` to reflect progress on Phase 13 milestones.
- Improved Nennung UI, backend persistence, and QA tracking for Neumarkt tournament.
- Added `NennungRepository` with methods for saving, updating status, and retrieving entries.
- Created `NennungController` to expose REST endpoints for Nennungen.
- Defined `NennungTable` schema with relevant fields and indices.
- Extended `MailPollingService` to parse incoming emails into `NennungEntity` and persist them.
- Updated `build.gradle.kts` with database dependencies and H2 configuration for local dev.
- Refined frontend layout in `OnlineNennungFormular` for improved usability and responsiveness.
- Created `MailServiceApplication` with Spring Boot setup.
- Added `MailPollingService` for IMAP polling, `TurnierNr` extraction, and auto-reply functionality.
- Implemented structured email sending for online nominations via `OnlineNennungFormular`.
- Updated frontend with `Erfolgsscreen` for nomination confirmation and fallback handling.
- Added build configurations for Mail-Service and frontend nomination module.
- Documented phase-based roadmap for Online-Nennung and Mail-Service rollout.
- Removed `AbteilungViewModel`, `BewerbAnlegenViewModel`, `BewerbViewModel`, and `CreateBewerbWizardScreen`.
- Cleaned up related imports and unused domain models.
- **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.
- **Domain Updates:**
- Introduced `AbteilungsWarnung` entity for structured warning handling compliant with ÖTO § 39.
- Added validation rules for mandatory and optional division thresholds and structural completeness.
- Implemented `CompetitionWarningService` and `AbteilungsRegelService` for domain-centric validations.
- Updated domain models (`Bewerb`, `Abteilung`) to reflect structured warning logic.
- **Services:**
- Expanded `BewerbService` to include warning validation through `CompetitionWarningService`.
- **Frontend Enhancements:**
- Updated `TurnierBewerbeTab` to display warnings using tooltips with clear descriptions and structured formatting.
- Modified `BewerbUiModel` to handle warnings and integrate them into the UI.
- **Persistence:**
- Implemented `CompetitionRepositoryImpl` to map database rows to the new domain models and validation logic.
- **Testing:**
- Added comprehensive unit tests for `validateStrukturellesTeilung` and division-specific warnings.
- Enhanced existing tests to validate the new warning structure and code-based assertions.
- **Docs:**
- Updated roadmap to reflect the completion of structural warnings implementation.
- **Core Updates:**
- Expanded `SyncEvent` model with additional fields (`eventId`, `sequenceNumber`, `originNodeId`, `createdAt`, `checksum`, `schemaVersion`) for improved event tracking and validation.
- Updated event classes (`PingEvent`, `PongEvent`, `DataChangedEvent`, `DataRequestEvent`) to align with the extended `SyncEvent`.
- **Frontend Enhancements:**
- Enhanced `BewerbViewModel` to handle sync events (`PingEvent`, `DataChangedEvent`) and observe connected peers using `SyncManager`.
- Added support for
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