Fix scroll during generate, restore Claude Code easter egg

- Preserve scroll position when clicking Generate
- Add back "Ps. Built with Claude Code" in FAQ

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

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

index.html

@@ -1228,6 +1228,10 @@
                         <h4>Why "Enable Audio" on iPhone?</h4>
                         <p>Apple blocks sound until you tap. Hit the button once and you're good.</p>
                     </div>
+                    <div class="faq-item">
+                        <h4>Ps.</h4>
+                        <p>Built with Claude Code.</p>
+                    </div>
                 </div>
             </main>
         </div>