Fix builder page layout: make new chat and history buttons sticky at top on desktop

- Moved sticky positioning from mobile-only to global CSS for .top-left-actions

- Buttons now stay fixed at top above content on all screen sizes

- Includes various other app updates (version management, server improvements)

chat/public/faq.html

@@ -233,12 +233,6 @@
                 Frequently Asked <span class="hero-gradient-text">Questions</span>
             </h1>
 
-            <div class="flex flex-col sm:flex-row justify-center items-center gap-4 mb-8">
-                <a href="/signup"
-                    class="w-full sm:w-auto px-8 py-4 bg-green-700 text-white rounded-full font-bold hover:bg-green-600 transition-colors shadow-[0_0_20px_rgba(22,163,74,0.3)]">
-                    Start Building Free
-                </a>
-            </div>
         </div>
     </section>