Add Share to X button with proper tweet text

- Added "Share to X" button next to "Copy link"
- Tweet text: "I made [song] game boy version. Click to listen or generate your own, made in Wario Synth by @b1rdmania"
- Updated Twitter cards to summary_large_image
- Dynamic OG description includes song title

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

play.html

@@ -16,7 +16,7 @@
     <meta property="og:url" content="https://motif-self.vercel.app/play" />
 
     <!-- Twitter Card -->
-    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:card" content="summary_large_image" />
     <meta name="twitter:title" content="WARIO SYNTH" />
     <meta name="twitter:description" content="Tap to play this Gameboy tune" />
     <meta name="twitter:image" content="https://motif-self.vercel.app/wariosynthlogo.png" />