feat: add shadcn admin workspace

admin/src/components/ui/textarea.tsx

@@ -0,0 +1,21 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, React.ComponentProps<'textarea'>>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          'flex min-h-[132px] w-full rounded-2xl border border-input bg-background/80 px-3 py-3 text-sm shadow-sm outline-none transition-colors placeholder:text-muted-foreground focus-visible:ring-2 focus-visible:ring-ring/70 disabled:cursor-not-allowed disabled:opacity-50',
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    )
+  },
+)
+Textarea.displayName = 'Textarea'
+
+export { Textarea }