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/builder.js

@@ -1854,8 +1854,6 @@ function showLoadingIndicator(type) {
   
   if (type === 'planning') {
     detailText.textContent = 'Analyzing your request and creating a development plan...';
-  } else {
-    detailText.textContent = 'Building your plugin with AI-generated code...';
   }
 
   // Add animation keyframes if not already added