Add share buttons to play.html (share page)

- Copy Link and Share to X buttons on the shared player page
- Consistent Game Boy styling with main page

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

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

play.html

@@ -268,6 +268,27 @@
         width: 0%;
       }
 
+      /* Share buttons */
+      .share-buttons {
+        margin-top: calc(var(--spacing-unit) * 2);
+        display: flex;
+        gap: calc(var(--spacing-unit) * 1.5);
+        flex-wrap: wrap;
+      }
+
+      .share-buttons button {
+        flex: 1;
+        min-width: 120px;
+        background: var(--gb-darkest);
+        color: var(--gb-light);
+        border-color: var(--gb-medium);
+      }
+
+      .share-buttons button:hover:not(:disabled) {
+        background: var(--gb-medium);
+        color: var(--gb-lightest);
+      }
+
       /* CTA link (inside card) */
       .cta-link-inline {
         margin-top: calc(var(--spacing-unit) * 2);
@@ -372,6 +393,12 @@
           </div>
         </div>
 
+        <!-- Share buttons -->
+        <div id="shareButtons" class="share-buttons">
+          <button id="copyLinkBtn" type="button">Copy link</button>
+          <button id="shareToXBtn" type="button">Share to X</button>
+        </div>
+
         <!-- iOS Audio Unlock -->
         <div id="iosAudioBanner" class="ios-audio-banner">
           <p>Check: not on silent, volume up, Focus mode off. Then tap:</p>