feat(#28): add break rule & order to games and UI

- Types: add BreakRule, break metadata to StandardGame, extend NewGameData/steps
- NewGame: add BreakRule and BreakOrder steps with auto-advance
- NewGameScreen: wire new steps into flow
- GameService: set up defaults, persist break order, compute next breaker on +1
- GameDetail: show breaker indicator; treat -1 as undo equivalent

Backfill defaults for existing games via service logic.

Refs #28

src/components/GameDetail.tsx

@@ -45,7 +45,17 @@ const GameDetail = ({ game, onFinishGame, onUpdateScore, onUpdateGame, onUndo, o
               className={styles['player-score'] + (name === 'Fränky' ? ' ' + styles['franky'] : '')}
               key={name + idx}
             >
-              <span className={styles['player-name']}>{name}</span>
+              <span className={styles['player-name']}>
+                {(() => {
+                  const order = (game as any).breakOrder as number[] | undefined;
+                  const breakerIdx = (game as any).currentBreakerIdx as number | undefined;
+                  if (order && typeof breakerIdx === 'number' && order[breakerIdx] === idx + 1) {
+                    return <span title="Break" aria-label="Break" style={{ display: 'inline-block', width: 10, height: 10, borderRadius: '50%', background: '#fff', marginRight: 6, verticalAlign: 'middle' }} />;
+                  }
+                  return null;
+                })()}
+                {name}
+              </span>
               <div className={styles['progress-bar']}>
                 <div 
                   className={styles['progress-fill']} 
@@ -72,7 +82,7 @@ const GameDetail = ({ game, onFinishGame, onUpdateScore, onUpdateGame, onUndo, o
                 <button
                   className={styles['score-button']}
                   disabled={isCompleted}
-                  onClick={() => handleScoreUpdate(idx+1, -1)}
+                  onClick={() => (onUndo ? onUndo() : undefined)}
                   aria-label={`Punkt abziehen für ${name}`}
                   title={`Punkt abziehen für ${name}`}
                 >-</button>