Previously a first N press during an active game showed a "Press N
again" toast and started a 3-second countdown — a UI-first violation
since the only continuation was another keystroke. The HUD New Game
button already routed through `ConfirmNewGameScreen` with real Cancel
/ New game buttons; this change makes keyboard N do the same.
- handle_keyboard_core fires NewGameRequestEvent::default() directly;
handle_new_game's existing active-game check spawns the modal.
- Shift+N keeps the keyboard power-user bypass (confirmed: true).
- N is suppressed while the confirm modal or restore prompt is open
so those modals' own input handlers can process N (cancel /
start-new-game) without us re-firing the same frame they close.
- KeyboardConfirmState, NEW_GAME_CONFIRM_WINDOW, NewGameConfirmEvent,
and the "Press N again" toast handler are removed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
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