fix(frontend): refine editor title and section tab scrollbars

Shrink the editable assistant title in prompt/workflow editors and keep the pencil icon visible. Apply scrollbar-subtle to section anchor tabs so horizontal scrollbars match dark theme.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/editor/section-anchor-tabs.tsx

@@ -59,7 +59,7 @@ export function SectionAnchorTabs({
   return (
     <nav
       aria-label={ariaLabel}
-      className={cn("shrink-0 overflow-x-auto overscroll-none", className)}
+      className={cn("scrollbar-subtle shrink-0 overflow-x-auto overscroll-none", className)}
     >
       {contentClassName ? (
         <div className={contentClassName}>{list}</div>