fix: remove unused imports to pass lint

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/admin/src/components/pos/pos-cart-panel.tsx

@@ -4,7 +4,6 @@ import { posMutations, posKeys, type Transaction } from '@/api/pos'
 import { Button } from '@/components/ui/button'
 import { Separator } from '@/components/ui/separator'
 import { Input } from '@/components/ui/input'
-import { Label } from '@/components/ui/label'
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover'
 import { X, Banknote, CreditCard, FileText, Ban, UserRound, Tag } from 'lucide-react'
 import { toast } from 'sonner'