fix: wrong style when breadcrumbs display background (#4472)

packages/@core/ui-kit/shadcn-ui/src/components/breadcrumb/breadcrumb-background.vue

@@ -83,7 +83,7 @@ li:last-child a::after {
 
 li a::before,
 li a::after {
-  @apply border-accent absolute top-0 h-0 w-0 border-[14px] border-solid content-[''];
+  @apply border-accent absolute top-0 h-0 w-0 border-[.875rem] border-solid content-[''];
 }
 
 li a::before {