fix(#28): preselect Winnerbreak on break rule step

- Default selection set to 'winnerbreak' so right arrow is available immediately
- Fallback to stored lastBreakRule or Winnerbreak

Refs #28

src/components/screens/NewGameScreen.tsx

@@ -147,7 +147,7 @@ export default function NewGameScreen({
         <BreakRuleStep
           onNext={handleBreakRuleNext}
           onCancel={handleStepBack}
-          initialValue={(data.breakRule as any) || (typeof window !== 'undefined' ? (localStorage.getItem('lastBreakRule') as any) : '') || ''}
+          initialValue={(data.breakRule as any) || (typeof window !== 'undefined' ? (localStorage.getItem('lastBreakRule') as any) : 'winnerbreak') || 'winnerbreak'}
         />
       )}