Move SignalR group join into GameManager and add support for player names and improved online join flow.
- Moved Groups.AddToGroupAsync call out of GameHubSocket into GameManager (hubContext.Groups.AddToGroupAsync) so group membership is handled when adding players to a game.
- GUI: added player name input to GameJoinMenu and updated JoinGameObject to include playerName and use string gameCode.
- OnlineMode & LocalMode: constructors updated to instantiate games without passing settings; removed WaitingForOpponent state and cleaned up event bindings.
- OnlineGame: rewrote to handle onGameCreated/onGameJoined/onGameStarted/onFieldUpdated/onGameEnded/onError, added joinGame validation (expects 6-digit code), join flow (connect + join), state updates, drop forwarding to player.drop(gameId, index) and place description updates.
- LocalGame: constructor signature simplified to no-arg.
These changes centralize group management, add player identification, validate join codes, and improve game state/event handling for online play.
Rename JoinMenu to GameJoinMenu and add a JoinGameObject model + OTP input for entering a 6-digit game code. Introduce a new JoinGameObject interface file. Update OnlineMode.vue to import and render GameJoinMenu and GameEndedMenu, add refs for joiningModel, game, gameField, currentSelectionIndex and gameEndedInformation, wire create/ join handlers (stubbed) and the main game view (Field and InfoField). Refactor LocalGame to OnlineGame, export it as default and add a stubbed drop method; adjust import path formatting. Several functions remain as stubs to be implemented in follow-up commits.
jonas