fix(subflow): updated subflow border to match block border (#2768)

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/subflows/subflow-node.tsx

@@ -148,7 +148,7 @@ export const SubflowNodeComponent = memo(({ data, id }: NodeProps<SubflowNodeDat
           ref={blockRef}
           onClick={() => setCurrentBlockId(id)}
           className={cn(
-            'workflow-drag-handle relative cursor-grab select-none rounded-[8px] border border-[var(--border)] [&:active]:cursor-grabbing',
+            'workflow-drag-handle relative cursor-grab select-none rounded-[8px] border border-[var(--border-1)] [&:active]:cursor-grabbing',
             'transition-block-bg transition-ring',
             'z-[20]'
           )}

apps/sim/app/workspace/[workspaceId]/w/components/preview/components/subflow.tsx

@@ -38,7 +38,7 @@ function WorkflowPreviewSubflowInner({ data }: NodeProps<WorkflowPreviewSubflowD
 
   return (
     <div
-      className='relative select-none rounded-[8px] border border-[var(--border)]'
+      className='relative select-none rounded-[8px] border border-[var(--border-1)]'
       style={{
         width,
         height,