style: fix timeline toolbar border to extend full width

apps/web/src/components/editor/timeline/timeline-cache-indicator.tsx

@@ -97,7 +97,7 @@ export function TimelineCacheIndicator({
             key={index}
             className={cn(
               "absolute top-0 h-px",
-              segment.cached ? "bg-primary" : "bg-border"
+              segment.cached ? "bg-primary" : "bg-transparent"
             )}
             style={{
               left: `${startX}px`,

apps/web/src/components/editor/timeline/timeline-toolbar.tsx

@@ -192,7 +192,7 @@ export function TimelineToolbar({
 
   const currentBookmarked = isBookmarked(currentTime);
   return (
-    <div className=" flex items-center justify-between px-2 py-1">
+    <div className=" flex items-center justify-between px-2 py-1 border-b">
       <div className="flex items-center gap-1 w-full">
         <TooltipProvider delayDuration={500}>
           <Tooltip>