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/apps.html

@@ -2428,6 +2428,13 @@
           }
         });
 
+        window.addEventListener('scroll', () => {
+          if (modal.style.display !== 'none') {
+            const config = tourSteps[currentStep - 1];
+            positionTourBox(config.target);
+          }
+        }, true);
+
         if (typeof document !== 'undefined') {
           document.addEventListener('keydown', function(e) {
             const onboardingModal = document.getElementById('onboarding-modal');