feat: Enhance Game component with extra puzzles feature

- Introduce requiredDailyKeys to track daily puzzle completion across genres.
- Implement logic to show an ExtraPuzzlesPopover when all daily puzzles are completed.
- Add localized messages for extra puzzles in both English and German.
- Update GenrePage and Home components to pass requiredDailyKeys to the Game component.

app/[locale]/[genre]/page.tsx

@@ -87,6 +87,9 @@ export default async function GenrePage({ params }: PageProps) {
         return s.launchDate && s.launchDate > now;
     });
 
+    // Required daily keys: global + all active genres (by localized name, as used in gameState storage)
+    const requiredDailyKeys = ['global', ...genres.map(g => getLocalizedValue(g.name, locale))];
+
     return (
         <>
             <div style={{ textAlign: 'center', padding: '1rem', background: '#f3f4f6' }}>
@@ -156,7 +159,7 @@ export default async function GenrePage({ params }: PageProps) {
                 )}
             </div>
             <NewsSection locale={locale} />
-            <Game dailyPuzzle={dailyPuzzle} genre={decodedGenre} />
+            <Game dailyPuzzle={dailyPuzzle} genre={decodedGenre} requiredDailyKeys={requiredDailyKeys} />
         </>
     );
 }