feat(admin-ui): shadcn primitives + @/ui barrel (Stage 2.1)

ordinis-admin-ui/src/ui/components/loading-block.tsx

@@ -0,0 +1,27 @@
+import { Loader2 } from 'lucide-react'
+import { cn } from '@/lib/utils'
+
+/**
+ * LoadingBlock — central spinner с подписью. Заменяет {@code @nstart/ui}
+ * LoadingBlock. Для inline placeholder используйте Skeleton.
+ */
+export type LoadingBlockProps = React.HTMLAttributes<HTMLDivElement> & {
+  label?: React.ReactNode
+}
+
+export function LoadingBlock({ className, label, ...props }: LoadingBlockProps) {
+  return (
+    <div
+      role="status"
+      aria-busy="true"
+      className={cn(
+        'flex flex-col items-center justify-center gap-2 py-12 text-mute',
+        className,
+      )}
+      {...props}
+    >
+      <Loader2 className="size-5 animate-spin text-accent" />
+      {label && <span className="text-sm">{label}</span>}
+    </div>
+  )
+}