Restrict native share dialog to mobile devices, use clipboard copy on desktop

components/Game.tsx

@@ -124,8 +124,10 @@ export default function Game({ dailyPuzzle, genre = null, isSpecial = false, max
 
         const text = `Hördle #${dailyPuzzle.id}\n${genreText}\n${speaker}${emojiGrid}\n\n#Hördle #Music\n\n${shareUrl}`;
 
-        // Try native Web Share API first (mobile-friendly)
-        if (navigator.share) {
+        // Try native Web Share API only on mobile devices
+        const isMobile = /iPhone|iPad|iPod|Android/i.test(navigator.userAgent);
+
+        if (isMobile && navigator.share) {
             try {
                 await navigator.share({
                     title: `Hördle #${dailyPuzzle.id}`,