fix: customer history query, seed transactions tied to accounts

- Fix customerHistoryOptions closure bug (historySearch was inaccessible)
- Pass itemSearch as parameter instead of capturing from outer scope
- Seed 5 completed transactions tied to accounts (Smith, Johnson, Garcia, Chen)
- Seed admin user with employee number 1001 and PIN 1234

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

packages/admin/src/components/pos/pos-customer-dialog.tsx

@@ -46,15 +46,15 @@ function accountSearchOptions(search: string) {
   })
 }
 
-function customerHistoryOptions(accountId: string | null) {
+function customerHistoryOptions(accountId: string | null, itemSearch?: string) {
   return queryOptions({
-    queryKey: ['pos', 'customer-history', accountId],
+    queryKey: ['pos', 'customer-history', accountId, itemSearch ?? ''],
     queryFn: () => api.get<{ data: Transaction[] }>('/v1/transactions', {
       accountId,
       limit: 10,
       sort: 'created_at',
       order: 'desc',
-      ...(historySearch ? { itemSearch: historySearch } : {}),
+      ...(itemSearch ? { itemSearch } : {}),
     }),
     enabled: !!accountId,
   })
@@ -74,7 +74,7 @@ export function POSCustomerDialog({ open, onOpenChange }: POSCustomerDialogProps
   const { data: searchData, isLoading } = useQuery(accountSearchOptions(search))
   const accounts = searchData?.data ?? []
 
-  const { data: historyData } = useQuery(customerHistoryOptions(showHistory ? accountId : null))
+  const { data: historyData } = useQuery(customerHistoryOptions(showHistory ? accountId : null, historySearch || undefined))
   const history = historyData?.data ?? []
 
   function handleSelect(account: Account) {