feat: add POS register screen with full-screen touch-optimized layout

Standalone register at /pos bypassing the admin sidebar layout:
- Two-panel layout: product search/grid (60%) + cart/payment (40%)
- Product search with barcode scan support (UPC lookup on Enter)
- Custom item entry dialog for ad-hoc items
- Cart with line items, tax, totals, and remove-item support
- Payment dialogs: cash (quick amounts + change calc), card, check
- Drawer open/close with balance reconciliation and over/short
- Auto-creates pending transaction on first item added
- POS link added to admin sidebar nav (module-gated)
- Zustand store for POS session state, React Query for server data

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

packages/admin/src/api/pos.ts

@@ -0,0 +1,163 @@
+import { queryOptions } from '@tanstack/react-query'
+import { api } from '@/lib/api-client'
+
+// --- Types ---
+
+export interface Transaction {
+  id: string
+  locationId: string | null
+  transactionNumber: string
+  accountId: string | null
+  repairTicketId: string | null
+  repairBatchId: string | null
+  transactionType: string
+  status: string
+  subtotal: string
+  discountTotal: string
+  taxTotal: string
+  total: string
+  paymentMethod: string | null
+  amountTendered: string | null
+  changeGiven: string | null
+  checkNumber: string | null
+  roundingAdjustment: string
+  taxExempt: boolean
+  taxExemptReason: string | null
+  processedBy: string
+  drawerSessionId: string | null
+  notes: string | null
+  completedAt: string | null
+  createdAt: string
+  updatedAt: string
+  lineItems?: TransactionLineItem[]
+}
+
+export interface TransactionLineItem {
+  id: string
+  transactionId: string
+  productId: string | null
+  inventoryUnitId: string | null
+  description: string
+  qty: number
+  unitPrice: string
+  discountAmount: string
+  discountReason: string | null
+  taxRate: string
+  taxAmount: string
+  lineTotal: string
+  createdAt: string
+}
+
+export interface DrawerSession {
+  id: string
+  locationId: string | null
+  openedBy: string
+  closedBy: string | null
+  openingBalance: string
+  closingBalance: string | null
+  expectedBalance: string | null
+  overShort: string | null
+  denominations: Record<string, number> | null
+  status: string
+  notes: string | null
+  openedAt: string
+  closedAt: string | null
+}
+
+export interface Discount {
+  id: string
+  name: string
+  discountType: string
+  discountValue: string
+  appliesTo: string
+  requiresApprovalAbove: string | null
+  isActive: boolean
+}
+
+export interface Product {
+  id: string
+  name: string
+  sku: string | null
+  upc: string | null
+  description: string | null
+  sellingPrice: string | null
+  costPrice: string | null
+  qtyOnHand: number | null
+  taxCategory: string
+  isSerialized: boolean
+  isActive: boolean
+}
+
+// --- Query Keys ---
+
+export const posKeys = {
+  transaction: (id: string) => ['pos', 'transaction', id] as const,
+  drawer: (locationId: string) => ['pos', 'drawer', locationId] as const,
+  products: (search: string) => ['pos', 'products', search] as const,
+  discounts: ['pos', 'discounts'] as const,
+}
+
+// --- Query Options ---
+
+export function transactionOptions(id: string | null) {
+  return queryOptions({
+    queryKey: posKeys.transaction(id ?? ''),
+    queryFn: () => api.get<Transaction>(`/v1/transactions/${id}`),
+    enabled: !!id,
+  })
+}
+
+export function currentDrawerOptions(locationId: string | null) {
+  return queryOptions({
+    queryKey: posKeys.drawer(locationId ?? ''),
+    queryFn: () => api.get<DrawerSession>('/v1/drawer/current', { locationId }),
+    enabled: !!locationId,
+    retry: false,
+  })
+}
+
+export function productSearchOptions(search: string) {
+  return queryOptions({
+    queryKey: posKeys.products(search),
+    queryFn: () => api.get<{ data: Product[]; pagination: any }>('/v1/products', { q: search, limit: 24, isActive: true }),
+    enabled: search.length >= 1,
+  })
+}
+
+export function discountListOptions() {
+  return queryOptions({
+    queryKey: posKeys.discounts,
+    queryFn: () => api.get<Discount[]>('/v1/discounts/all'),
+  })
+}
+
+// --- Mutations ---
+
+export const posMutations = {
+  createTransaction: (data: { transactionType: string; locationId?: string }) =>
+    api.post<Transaction>('/v1/transactions', data),
+
+  addLineItem: (txnId: string, data: { productId?: string; inventoryUnitId?: string; description: string; qty: number; unitPrice: number }) =>
+    api.post<TransactionLineItem>(`/v1/transactions/${txnId}/line-items`, data),
+
+  removeLineItem: (txnId: string, lineItemId: string) =>
+    api.del<TransactionLineItem>(`/v1/transactions/${txnId}/line-items/${lineItemId}`),
+
+  applyDiscount: (txnId: string, data: { discountId?: string; amount: number; reason: string; lineItemId?: string }) =>
+    api.post<Transaction>(`/v1/transactions/${txnId}/discounts`, data),
+
+  complete: (txnId: string, data: { paymentMethod: string; amountTendered?: number; checkNumber?: string }) =>
+    api.post<Transaction>(`/v1/transactions/${txnId}/complete`, data),
+
+  void: (txnId: string) =>
+    api.post<Transaction>(`/v1/transactions/${txnId}/void`, {}),
+
+  openDrawer: (data: { locationId?: string; openingBalance: number }) =>
+    api.post<DrawerSession>('/v1/drawer/open', data),
+
+  closeDrawer: (id: string, data: { closingBalance: number; denominations?: Record<string, number>; notes?: string }) =>
+    api.post<DrawerSession>(`/v1/drawer/${id}/close`, data),
+
+  lookupUpc: (upc: string) =>
+    api.get<Product>(`/v1/products/lookup/upc/${upc}`),
+}

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

@@ -0,0 +1,179 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { usePOSStore } from '@/stores/pos.store'
+import { posMutations, posKeys, type Transaction } from '@/api/pos'
+import { Button } from '@/components/ui/button'
+import { Separator } from '@/components/ui/separator'
+import { X, Banknote, CreditCard, FileText, Ban } from 'lucide-react'
+import { toast } from 'sonner'
+import { useState } from 'react'
+import { POSPaymentDialog } from './pos-payment-dialog'
+
+interface POSCartPanelProps {
+  transaction: Transaction | null
+}
+
+export function POSCartPanel({ transaction }: POSCartPanelProps) {
+  const queryClient = useQueryClient()
+  const { currentTransactionId, setTransaction } = usePOSStore()
+  const [paymentMethod, setPaymentMethod] = useState<string | null>(null)
+  const lineItems = transaction?.lineItems ?? []
+
+  const removeItemMutation = useMutation({
+    mutationFn: (lineItemId: string) =>
+      posMutations.removeLineItem(currentTransactionId!, lineItemId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId!) })
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const voidMutation = useMutation({
+    mutationFn: () => posMutations.void(currentTransactionId!),
+    onSuccess: () => {
+      setTransaction(null)
+      toast.success('Transaction voided')
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const subtotal = parseFloat(transaction?.subtotal ?? '0')
+  const discountTotal = parseFloat(transaction?.discountTotal ?? '0')
+  const taxTotal = parseFloat(transaction?.taxTotal ?? '0')
+  const total = parseFloat(transaction?.total ?? '0')
+  const hasItems = lineItems.length > 0
+  const isPending = transaction?.status === 'pending'
+
+  function handlePaymentComplete() {
+    setPaymentMethod(null)
+    setTransaction(null)
+  }
+
+  return (
+    <div className="flex flex-col h-full bg-card">
+      {/* Header */}
+      <div className="p-3 border-b border-border">
+        <div className="flex items-center justify-between">
+          <h2 className="font-semibold text-base">Current Sale</h2>
+          {transaction && (
+            <span className="text-xs text-muted-foreground font-mono">
+              {transaction.transactionNumber}
+            </span>
+          )}
+        </div>
+      </div>
+
+      {/* Line items */}
+      <div className="flex-1 overflow-y-auto">
+        {lineItems.length === 0 ? (
+          <div className="flex items-center justify-center h-full text-muted-foreground text-sm">
+            No items yet
+          </div>
+        ) : (
+          <div className="divide-y divide-border">
+            {lineItems.map((item) => (
+              <div key={item.id} className="flex items-center gap-2 px-3 py-2.5 group">
+                <div className="flex-1 min-w-0">
+                  <p className="text-sm font-medium truncate">{item.description}</p>
+                  <p className="text-xs text-muted-foreground">
+                    {item.qty} x ${parseFloat(item.unitPrice).toFixed(2)}
+                    {parseFloat(item.taxAmount) > 0 && (
+                      <span className="ml-2">tax ${parseFloat(item.taxAmount).toFixed(2)}</span>
+                    )}
+                  </p>
+                </div>
+                <span className="text-sm font-medium tabular-nums">
+                  ${parseFloat(item.lineTotal).toFixed(2)}
+                </span>
+                {isPending && (
+                  <Button
+                    variant="ghost"
+                    size="icon"
+                    className="h-8 w-8 opacity-0 group-hover:opacity-100 shrink-0"
+                    onClick={() => removeItemMutation.mutate(item.id)}
+                    disabled={removeItemMutation.isPending}
+                  >
+                    <X className="h-4 w-4 text-destructive" />
+                  </Button>
+                )}
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+
+      {/* Totals + payment */}
+      <div className="shrink-0 border-t border-border">
+        <div className="px-3 py-2 space-y-1 text-sm">
+          <div className="flex justify-between">
+            <span className="text-muted-foreground">Subtotal</span>
+            <span className="tabular-nums">${subtotal.toFixed(2)}</span>
+          </div>
+          {discountTotal > 0 && (
+            <div className="flex justify-between text-green-600">
+              <span>Discount</span>
+              <span className="tabular-nums">-${discountTotal.toFixed(2)}</span>
+            </div>
+          )}
+          <div className="flex justify-between">
+            <span className="text-muted-foreground">Tax</span>
+            <span className="tabular-nums">${taxTotal.toFixed(2)}</span>
+          </div>
+          <Separator />
+          <div className="flex justify-between text-lg font-bold pt-1">
+            <span>Total</span>
+            <span className="tabular-nums">${total.toFixed(2)}</span>
+          </div>
+        </div>
+
+        {/* Payment buttons */}
+        <div className="p-3 grid grid-cols-2 gap-2">
+          <Button
+            className="h-12 text-sm gap-2"
+            disabled={!hasItems || !isPending}
+            onClick={() => setPaymentMethod('cash')}
+          >
+            <Banknote className="h-4 w-4" />
+            Cash
+          </Button>
+          <Button
+            className="h-12 text-sm gap-2"
+            disabled={!hasItems || !isPending}
+            onClick={() => setPaymentMethod('card_present')}
+          >
+            <CreditCard className="h-4 w-4" />
+            Card
+          </Button>
+          <Button
+            variant="outline"
+            className="h-12 text-sm gap-2"
+            disabled={!hasItems || !isPending}
+            onClick={() => setPaymentMethod('check')}
+          >
+            <FileText className="h-4 w-4" />
+            Check
+          </Button>
+          <Button
+            variant="destructive"
+            className="h-12 text-sm gap-2"
+            disabled={!hasItems || !isPending}
+            onClick={() => voidMutation.mutate()}
+          >
+            <Ban className="h-4 w-4" />
+            Void
+          </Button>
+        </div>
+      </div>
+
+      {/* Payment dialog */}
+      {paymentMethod && transaction && (
+        <POSPaymentDialog
+          open={!!paymentMethod}
+          onOpenChange={(open) => { if (!open) setPaymentMethod(null) }}
+          paymentMethod={paymentMethod}
+          transaction={transaction}
+          onComplete={handlePaymentComplete}
+        />
+      )}
+    </div>
+  )
+}

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

@@ -0,0 +1,139 @@
+import { useState } from 'react'
+import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { usePOSStore } from '@/stores/pos.store'
+import { posMutations, posKeys, type DrawerSession } from '@/api/pos'
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Separator } from '@/components/ui/separator'
+import { toast } from 'sonner'
+
+interface POSDrawerDialogProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  drawer: DrawerSession | null
+}
+
+export function POSDrawerDialog({ open, onOpenChange, drawer }: POSDrawerDialogProps) {
+  const queryClient = useQueryClient()
+  const { locationId, setDrawerSession } = usePOSStore()
+  const isOpen = drawer?.status === 'open'
+
+  const [openingBalance, setOpeningBalance] = useState('200')
+  const [closingBalance, setClosingBalance] = useState('')
+  const [notes, setNotes] = useState('')
+
+  const openMutation = useMutation({
+    mutationFn: () =>
+      posMutations.openDrawer({
+        locationId: locationId ?? undefined,
+        openingBalance: parseFloat(openingBalance) || 0,
+      }),
+    onSuccess: (session) => {
+      setDrawerSession(session.id)
+      queryClient.invalidateQueries({ queryKey: posKeys.drawer(locationId ?? '') })
+      toast.success('Drawer opened')
+      onOpenChange(false)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const closeMutation = useMutation({
+    mutationFn: () =>
+      posMutations.closeDrawer(drawer!.id, {
+        closingBalance: parseFloat(closingBalance) || 0,
+        notes: notes || undefined,
+      }),
+    onSuccess: (session) => {
+      setDrawerSession(null)
+      queryClient.invalidateQueries({ queryKey: posKeys.drawer(locationId ?? '') })
+      const overShort = parseFloat(session.overShort ?? '0')
+      if (Math.abs(overShort) < 0.01) {
+        toast.success('Drawer closed - balanced')
+      } else {
+        toast.warning(`Drawer closed - ${overShort > 0 ? 'over' : 'short'} $${Math.abs(overShort).toFixed(2)}`)
+      }
+      onOpenChange(false)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="max-w-sm">
+        <DialogHeader>
+          <DialogTitle>{isOpen ? 'Close Drawer' : 'Open Drawer'}</DialogTitle>
+        </DialogHeader>
+
+        {isOpen ? (
+          <div className="space-y-4">
+            <div className="text-sm space-y-1">
+              <div className="flex justify-between">
+                <span className="text-muted-foreground">Opening Balance</span>
+                <span>${parseFloat(drawer!.openingBalance).toFixed(2)}</span>
+              </div>
+              <div className="flex justify-between">
+                <span className="text-muted-foreground">Opened</span>
+                <span>{new Date(drawer!.openedAt).toLocaleTimeString()}</span>
+              </div>
+            </div>
+            <Separator />
+            <div className="space-y-2">
+              <Label>Closing Balance *</Label>
+              <Input
+                type="number"
+                step="0.01"
+                min="0"
+                value={closingBalance}
+                onChange={(e) => setClosingBalance(e.target.value)}
+                placeholder="Count the cash in the drawer"
+                className="h-11 text-lg"
+                autoFocus
+              />
+            </div>
+            <div className="space-y-2">
+              <Label>Notes</Label>
+              <Input
+                value={notes}
+                onChange={(e) => setNotes(e.target.value)}
+                placeholder="End of shift notes"
+                className="h-11"
+              />
+            </div>
+            <Button
+              className="w-full h-12"
+              onClick={() => closeMutation.mutate()}
+              disabled={!closingBalance || closeMutation.isPending}
+            >
+              {closeMutation.isPending ? 'Closing...' : 'Close Drawer'}
+            </Button>
+          </div>
+        ) : (
+          <div className="space-y-4">
+            <div className="space-y-2">
+              <Label>Opening Balance *</Label>
+              <Input
+                type="number"
+                step="0.01"
+                min="0"
+                value={openingBalance}
+                onChange={(e) => setOpeningBalance(e.target.value)}
+                placeholder="Starting cash amount"
+                className="h-11 text-lg"
+                autoFocus
+              />
+            </div>
+            <Button
+              className="w-full h-12"
+              onClick={() => openMutation.mutate()}
+              disabled={!openingBalance || openMutation.isPending}
+            >
+              {openMutation.isPending ? 'Opening...' : 'Open Drawer'}
+            </Button>
+          </div>
+        )}
+      </DialogContent>
+    </Dialog>
+  )
+}

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

@@ -0,0 +1,264 @@
+import { useState, useRef, useCallback } from 'react'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { usePOSStore } from '@/stores/pos.store'
+import { productSearchOptions, posMutations, posKeys, type Transaction, type Product } from '@/api/pos'
+import { Input } from '@/components/ui/input'
+import { Button } from '@/components/ui/button'
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
+import { Label } from '@/components/ui/label'
+import { Skeleton } from '@/components/ui/skeleton'
+import { Search, ScanBarcode, Wrench, PenLine } from 'lucide-react'
+import { toast } from 'sonner'
+
+interface POSItemPanelProps {
+  transaction: Transaction | null
+}
+
+export function POSItemPanel({ transaction }: POSItemPanelProps) {
+  const queryClient = useQueryClient()
+  const { currentTransactionId, setTransaction, locationId } = usePOSStore()
+  const [search, setSearch] = useState('')
+  const [customOpen, setCustomOpen] = useState(false)
+  const [customDesc, setCustomDesc] = useState('')
+  const [customPrice, setCustomPrice] = useState('')
+  const [customQty, setCustomQty] = useState('1')
+  const searchRef = useRef<HTMLInputElement>(null)
+
+  // Debounced product search
+  const { data: productsData, isLoading: searchLoading } = useQuery({
+    ...productSearchOptions(search),
+    enabled: search.length >= 1,
+  })
+  const products = productsData?.data ?? []
+
+  // Add line item mutation
+  const addItemMutation = useMutation({
+    mutationFn: async (product: Product) => {
+      let txnId = currentTransactionId
+      // Auto-create transaction if none exists
+      if (!txnId) {
+        const txn = await posMutations.createTransaction({
+          transactionType: 'sale',
+          locationId: locationId ?? undefined,
+        })
+        txnId = txn.id
+        setTransaction(txnId)
+      }
+      return posMutations.addLineItem(txnId, {
+        productId: product.id,
+        description: product.name,
+        qty: 1,
+        unitPrice: parseFloat(product.sellingPrice ?? '0'),
+      })
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId ?? '') })
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  // Custom item mutation
+  const addCustomMutation = useMutation({
+    mutationFn: async () => {
+      let txnId = currentTransactionId
+      if (!txnId) {
+        const txn = await posMutations.createTransaction({
+          transactionType: 'sale',
+          locationId: locationId ?? undefined,
+        })
+        txnId = txn.id
+        setTransaction(txnId)
+      }
+      return posMutations.addLineItem(txnId, {
+        description: customDesc,
+        qty: parseInt(customQty) || 1,
+        unitPrice: parseFloat(customPrice) || 0,
+      })
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId ?? '') })
+      setCustomOpen(false)
+      setCustomDesc('')
+      setCustomPrice('')
+      setCustomQty('1')
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  // UPC scan
+  const scanMutation = useMutation({
+    mutationFn: async (upc: string) => {
+      const product = await posMutations.lookupUpc(upc)
+      let txnId = currentTransactionId
+      if (!txnId) {
+        const txn = await posMutations.createTransaction({
+          transactionType: 'sale',
+          locationId: locationId ?? undefined,
+        })
+        txnId = txn.id
+        setTransaction(txnId)
+      }
+      return posMutations.addLineItem(txnId, {
+        productId: product.id,
+        description: product.name,
+        qty: 1,
+        unitPrice: parseFloat(product.sellingPrice ?? '0'),
+      })
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId ?? '') })
+      setSearch('')
+      toast.success('Item scanned')
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const handleSearchKeyDown = useCallback((e: React.KeyboardEvent<HTMLInputElement>) => {
+    // Barcode scanners typically send Enter after the code
+    if (e.key === 'Enter' && search.length >= 6) {
+      // Looks like a UPC — try scanning
+      scanMutation.mutate(search)
+    }
+  }, [search, scanMutation])
+
+  return (
+    <div className="flex flex-col h-full">
+      {/* Search bar */}
+      <div className="p-3 border-b border-border">
+        <div className="relative">
+          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
+          <Input
+            ref={searchRef}
+            value={search}
+            onChange={(e) => setSearch(e.target.value)}
+            onKeyDown={handleSearchKeyDown}
+            placeholder="Search products or scan barcode..."
+            className="pl-10 h-11 text-base"
+            autoFocus
+          />
+        </div>
+      </div>
+
+      {/* Product grid */}
+      <div className="flex-1 overflow-y-auto p-3">
+        {searchLoading ? (
+          <div className="grid grid-cols-3 gap-3">
+            {Array.from({ length: 6 }).map((_, i) => (
+              <Skeleton key={i} className="h-24 rounded-lg" />
+            ))}
+          </div>
+        ) : products.length > 0 ? (
+          <div className="grid grid-cols-3 gap-3">
+            {products.map((product) => (
+              <button
+                key={product.id}
+                onClick={() => addItemMutation.mutate(product)}
+                disabled={addItemMutation.isPending}
+                className="flex flex-col items-start p-3 rounded-lg border border-border bg-card hover:bg-accent active:bg-accent/80 transition-colors text-left min-h-[80px]"
+              >
+                <span className="font-medium text-sm line-clamp-2">{product.name}</span>
+                <div className="mt-auto flex items-center justify-between w-full pt-1">
+                  <span className="text-base font-semibold">${parseFloat(product.sellingPrice ?? '0').toFixed(2)}</span>
+                  {product.sku && <span className="text-xs text-muted-foreground">{product.sku}</span>}
+                </div>
+                {product.isSerialized ? (
+                  <span className="text-[10px] text-muted-foreground">Serialized</span>
+                ) : product.qtyOnHand !== null ? (
+                  <span className="text-[10px] text-muted-foreground">{product.qtyOnHand} in stock</span>
+                ) : null}
+              </button>
+            ))}
+          </div>
+        ) : search.length >= 1 ? (
+          <div className="flex items-center justify-center h-32 text-muted-foreground text-sm">
+            No products found for "{search}"
+          </div>
+        ) : (
+          <div className="flex items-center justify-center h-32 text-muted-foreground text-sm">
+            Search for products to add to the sale
+          </div>
+        )}
+      </div>
+
+      {/* Quick action buttons */}
+      <div className="p-3 border-t border-border flex gap-2">
+        <Button
+          variant="outline"
+          className="flex-1 h-11 text-sm gap-2"
+          onClick={() => searchRef.current?.focus()}
+        >
+          <ScanBarcode className="h-4 w-4" />
+          Scan
+        </Button>
+        <Button
+          variant="outline"
+          className="flex-1 h-11 text-sm gap-2"
+          disabled
+        >
+          <Wrench className="h-4 w-4" />
+          Repairs
+        </Button>
+        <Button
+          variant="outline"
+          className="flex-1 h-11 text-sm gap-2"
+          onClick={() => setCustomOpen(true)}
+        >
+          <PenLine className="h-4 w-4" />
+          Custom
+        </Button>
+      </div>
+
+      {/* Custom item dialog */}
+      <Dialog open={customOpen} onOpenChange={setCustomOpen}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>Add Custom Item</DialogTitle>
+          </DialogHeader>
+          <form
+            onSubmit={(e) => { e.preventDefault(); addCustomMutation.mutate() }}
+            className="space-y-4"
+          >
+            <div className="space-y-2">
+              <Label>Description *</Label>
+              <Input
+                value={customDesc}
+                onChange={(e) => setCustomDesc(e.target.value)}
+                placeholder="Item description"
+                required
+                className="h-11"
+              />
+            </div>
+            <div className="grid grid-cols-2 gap-4">
+              <div className="space-y-2">
+                <Label>Price *</Label>
+                <Input
+                  type="number"
+                  step="0.01"
+                  min="0"
+                  value={customPrice}
+                  onChange={(e) => setCustomPrice(e.target.value)}
+                  placeholder="0.00"
+                  required
+                  className="h-11"
+                />
+              </div>
+              <div className="space-y-2">
+                <Label>Qty</Label>
+                <Input
+                  type="number"
+                  min="1"
+                  value={customQty}
+                  onChange={(e) => setCustomQty(e.target.value)}
+                  className="h-11"
+                />
+              </div>
+            </div>
+            <Button type="submit" className="w-full h-11" disabled={addCustomMutation.isPending}>
+              {addCustomMutation.isPending ? 'Adding...' : 'Add Item'}
+            </Button>
+          </form>
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}

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

@@ -0,0 +1,202 @@
+import { useState } from 'react'
+import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { usePOSStore } from '@/stores/pos.store'
+import { posMutations, posKeys, type Transaction } from '@/api/pos'
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Separator } from '@/components/ui/separator'
+import { CheckCircle } from 'lucide-react'
+import { toast } from 'sonner'
+
+interface POSPaymentDialogProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  paymentMethod: string
+  transaction: Transaction
+  onComplete: () => void
+}
+
+export function POSPaymentDialog({ open, onOpenChange, paymentMethod, transaction, onComplete }: POSPaymentDialogProps) {
+  const queryClient = useQueryClient()
+  const { currentTransactionId } = usePOSStore()
+  const total = parseFloat(transaction.total)
+  const [amountTendered, setAmountTendered] = useState('')
+  const [checkNumber, setCheckNumber] = useState('')
+  const [completed, setCompleted] = useState(false)
+  const [result, setResult] = useState<Transaction | null>(null)
+
+  const completeMutation = useMutation({
+    mutationFn: () => {
+      const data: { paymentMethod: string; amountTendered?: number; checkNumber?: string } = {
+        paymentMethod,
+      }
+      if (paymentMethod === 'cash') {
+        data.amountTendered = parseFloat(amountTendered) || 0
+      }
+      if (paymentMethod === 'check') {
+        data.checkNumber = checkNumber || undefined
+      }
+      return posMutations.complete(currentTransactionId!, data)
+    },
+    onSuccess: (txn) => {
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId!) })
+      setResult(txn)
+      setCompleted(true)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const tenderedAmount = parseFloat(amountTendered) || 0
+  const changeDue = paymentMethod === 'cash' ? Math.max(0, tenderedAmount - total) : 0
+  const canComplete = paymentMethod === 'cash'
+    ? tenderedAmount >= total
+    : true
+
+  function handleDone() {
+    onComplete()
+    onOpenChange(false)
+  }
+
+  const QUICK_AMOUNTS = [1, 5, 10, 20, 50, 100]
+
+  if (completed && result) {
+    const changeGiven = parseFloat(result.changeGiven ?? '0')
+    const roundingAdj = parseFloat(result.roundingAdjustment ?? '0')
+
+    return (
+      <Dialog open={open} onOpenChange={() => handleDone()}>
+        <DialogContent className="max-w-sm">
+          <div className="flex flex-col items-center text-center space-y-4 py-4">
+            <CheckCircle className="h-12 w-12 text-green-500" />
+            <h2 className="text-xl font-bold">Sale Complete</h2>
+            <p className="text-muted-foreground text-sm">{result.transactionNumber}</p>
+
+            <div className="w-full text-sm space-y-1">
+              <div className="flex justify-between font-semibold text-base">
+                <span>Total</span>
+                <span>${parseFloat(result.total).toFixed(2)}</span>
+              </div>
+              {roundingAdj !== 0 && (
+                <div className="flex justify-between text-muted-foreground">
+                  <span>Rounding</span>
+                  <span>{roundingAdj > 0 ? '+' : ''}{roundingAdj.toFixed(2)}</span>
+                </div>
+              )}
+              {paymentMethod === 'cash' && (
+                <>
+                  <div className="flex justify-between">
+                    <span>Tendered</span>
+                    <span>${parseFloat(result.amountTendered ?? '0').toFixed(2)}</span>
+                  </div>
+                  {changeGiven > 0 && (
+                    <div className="flex justify-between text-lg font-bold text-green-600">
+                      <span>Change Due</span>
+                      <span>${changeGiven.toFixed(2)}</span>
+                    </div>
+                  )}
+                </>
+              )}
+            </div>
+
+            <Button className="w-full h-12 text-base" onClick={handleDone}>
+              New Sale
+            </Button>
+          </div>
+        </DialogContent>
+      </Dialog>
+    )
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="max-w-sm">
+        <DialogHeader>
+          <DialogTitle>
+            {paymentMethod === 'cash' ? 'Cash Payment' : paymentMethod === 'check' ? 'Check Payment' : 'Card Payment'}
+          </DialogTitle>
+        </DialogHeader>
+
+        <div className="space-y-4">
+          <div className="flex justify-between text-lg font-bold">
+            <span>Total Due</span>
+            <span>${total.toFixed(2)}</span>
+          </div>
+
+          <Separator />
+
+          {paymentMethod === 'cash' && (
+            <>
+              <div className="space-y-2">
+                <Label>Amount Tendered</Label>
+                <Input
+                  type="number"
+                  step="0.01"
+                  min="0"
+                  value={amountTendered}
+                  onChange={(e) => setAmountTendered(e.target.value)}
+                  placeholder="0.00"
+                  className="h-12 text-xl text-right font-mono"
+                  autoFocus
+                />
+              </div>
+              <div className="grid grid-cols-3 gap-2">
+                {QUICK_AMOUNTS.map((amt) => (
+                  <Button
+                    key={amt}
+                    variant="outline"
+                    className="h-11"
+                    onClick={() => setAmountTendered(String(amt))}
+                  >
+                    ${amt}
+                  </Button>
+                ))}
+              </div>
+              <Button
+                variant="outline"
+                className="w-full h-11"
+                onClick={() => setAmountTendered(total.toFixed(2))}
+              >
+                Exact ${total.toFixed(2)}
+              </Button>
+              {tenderedAmount >= total && (
+                <div className="flex justify-between text-lg font-bold text-green-600">
+                  <span>Change</span>
+                  <span>${changeDue.toFixed(2)}</span>
+                </div>
+              )}
+            </>
+          )}
+
+          {paymentMethod === 'check' && (
+            <div className="space-y-2">
+              <Label>Check Number</Label>
+              <Input
+                value={checkNumber}
+                onChange={(e) => setCheckNumber(e.target.value)}
+                placeholder="Check #"
+                className="h-11"
+                autoFocus
+              />
+            </div>
+          )}
+
+          {paymentMethod === 'card_present' && (
+            <p className="text-sm text-muted-foreground text-center py-4">
+              Process card payment on terminal, then confirm below.
+            </p>
+          )}
+
+          <Button
+            className="w-full h-12 text-base"
+            disabled={!canComplete || completeMutation.isPending}
+            onClick={() => completeMutation.mutate()}
+          >
+            {completeMutation.isPending ? 'Processing...' : `Complete ${paymentMethod === 'cash' ? 'Cash' : paymentMethod === 'check' ? 'Check' : 'Card'} Sale`}
+          </Button>
+        </div>
+      </DialogContent>
+    </Dialog>
+  )
+}

packages/admin/src/components/pos/pos-register.tsx

@@ -0,0 +1,72 @@
+import { useEffect } from 'react'
+import { useQuery, useQueryClient } from '@tanstack/react-query'
+import { queryOptions } from '@tanstack/react-query'
+import { api } from '@/lib/api-client'
+import { usePOSStore } from '@/stores/pos.store'
+import { currentDrawerOptions, transactionOptions } from '@/api/pos'
+import { POSTopBar } from './pos-top-bar'
+import { POSItemPanel } from './pos-item-panel'
+import { POSCartPanel } from './pos-cart-panel'
+
+interface Location {
+  id: string
+  name: string
+}
+
+function locationsOptions() {
+  return queryOptions({
+    queryKey: ['locations'],
+    queryFn: () => api.get<{ data: Location[] }>('/v1/locations'),
+  })
+}
+
+export function POSRegister() {
+  const { locationId, setLocation, currentTransactionId, drawerSessionId, setDrawerSession } = usePOSStore()
+  const queryClient = useQueryClient()
+
+  // Fetch locations
+  const { data: locationsData } = useQuery(locationsOptions())
+  const locations = locationsData?.data ?? []
+
+  // Auto-select first location
+  useEffect(() => {
+    if (!locationId && locations.length > 0) {
+      setLocation(locations[0].id)
+    }
+  }, [locationId, locations, setLocation])
+
+  // Fetch current drawer for selected location
+  const { data: drawer } = useQuery({
+    ...currentDrawerOptions(locationId),
+    retry: false,
+  })
+
+  // Sync drawer session ID
+  useEffect(() => {
+    if (drawer?.id && drawer.status === 'open') {
+      setDrawerSession(drawer.id)
+    }
+  }, [drawer, setDrawerSession])
+
+  // Fetch current transaction
+  const { data: transaction } = useQuery(transactionOptions(currentTransactionId))
+
+  return (
+    <div className="flex flex-col h-full">
+      <POSTopBar
+        locations={locations}
+        locationId={locationId}
+        onLocationChange={setLocation}
+        drawer={drawer ?? null}
+      />
+      <div className="flex flex-1 min-h-0">
+        <div className="w-[60%] border-r border-border overflow-hidden">
+          <POSItemPanel transaction={transaction ?? null} />
+        </div>
+        <div className="w-[40%] overflow-hidden">
+          <POSCartPanel transaction={transaction ?? null} />
+        </div>
+      </div>
+    </div>
+  )
+}

packages/admin/src/components/pos/pos-top-bar.tsx

@@ -0,0 +1,91 @@
+import { Link, useRouter } from '@tanstack/react-router'
+import { useAuthStore } from '@/stores/auth.store'
+import { usePOSStore } from '@/stores/pos.store'
+import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { ArrowLeft, LogOut, DollarSign } from 'lucide-react'
+import type { DrawerSession } from '@/api/pos'
+import { useState } from 'react'
+import { POSDrawerDialog } from './pos-drawer-dialog'
+
+interface POSTopBarProps {
+  locations: { id: string; name: string }[]
+  locationId: string | null
+  onLocationChange: (id: string) => void
+  drawer: DrawerSession | null
+}
+
+export function POSTopBar({ locations, locationId, onLocationChange, drawer }: POSTopBarProps) {
+  const router = useRouter()
+  const user = useAuthStore((s) => s.user)
+  const logout = useAuthStore((s) => s.logout)
+  const [drawerDialogOpen, setDrawerDialogOpen] = useState(false)
+
+  const drawerOpen = drawer?.status === 'open'
+
+  function handleLogout() {
+    logout()
+    router.navigate({ to: '/login', replace: true })
+  }
+
+  return (
+    <>
+      <div className="h-12 border-b border-border bg-card flex items-center justify-between px-3 shrink-0">
+        {/* Left: back + location */}
+        <div className="flex items-center gap-3">
+          <Link to="/" className="flex items-center gap-1 text-sm text-muted-foreground hover:text-foreground">
+            <ArrowLeft className="h-4 w-4" />
+            <span className="hidden sm:inline">Admin</span>
+          </Link>
+
+          {locations.length > 1 ? (
+            <Select value={locationId ?? ''} onValueChange={onLocationChange}>
+              <SelectTrigger className="h-8 w-48 text-sm">
+                <SelectValue placeholder="Select location" />
+              </SelectTrigger>
+              <SelectContent>
+                {locations.map((loc) => (
+                  <SelectItem key={loc.id} value={loc.id}>{loc.name}</SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          ) : locations.length === 1 ? (
+            <span className="text-sm font-medium">{locations[0].name}</span>
+          ) : null}
+        </div>
+
+        {/* Center: drawer status */}
+        <Button
+          variant="ghost"
+          size="sm"
+          className="flex items-center gap-2"
+          onClick={() => setDrawerDialogOpen(true)}
+        >
+          <DollarSign className="h-4 w-4" />
+          {drawerOpen ? (
+            <Badge variant="default" className="text-xs">
+              Drawer Open &mdash; ${parseFloat(drawer!.openingBalance).toFixed(2)}
+            </Badge>
+          ) : (
+            <Badge variant="outline" className="text-xs">Drawer Closed</Badge>
+          )}
+        </Button>
+
+        {/* Right: user + logout */}
+        <div className="flex items-center gap-2">
+          <span className="text-sm text-muted-foreground">{user?.firstName}</span>
+          <Button variant="ghost" size="icon" className="h-8 w-8" onClick={handleLogout} title="Sign out">
+            <LogOut className="h-4 w-4" />
+          </Button>
+        </div>
+      </div>
+
+      <POSDrawerDialog
+        open={drawerDialogOpen}
+        onOpenChange={setDrawerDialogOpen}
+        drawer={drawer}
+      />
+    </>
+  )
+}

packages/admin/src/routeTree.gen.ts

@@ -9,6 +9,7 @@
 // Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
 
 import { Route as rootRouteImport } from './routes/__root'
+import { Route as PosRouteImport } from './routes/pos'
 import { Route as LoginRouteImport } from './routes/login'
 import { Route as AuthenticatedRouteImport } from './routes/_authenticated'
 import { Route as AuthenticatedIndexRouteImport } from './routes/_authenticated/index'
@@ -56,6 +57,11 @@ import { Route as AuthenticatedAccountsAccountIdMembersRouteImport } from './rou
 import { Route as AuthenticatedAccountsAccountIdEnrollmentsRouteImport } from './routes/_authenticated/accounts/$accountId/enrollments'
 import { Route as AuthenticatedLessonsScheduleInstructorsInstructorIdRouteImport } from './routes/_authenticated/lessons/schedule/instructors/$instructorId'
 
+const PosRoute = PosRouteImport.update({
+  id: '/pos',
+  path: '/pos',
+  getParentRoute: () => rootRouteImport,
+} as any)
 const LoginRoute = LoginRouteImport.update({
   id: '/login',
   path: '/login',
@@ -323,6 +329,7 @@ const AuthenticatedLessonsScheduleInstructorsInstructorIdRoute =
 export interface FileRoutesByFullPath {
   '/': typeof AuthenticatedIndexRoute
   '/login': typeof LoginRoute
+  '/pos': typeof PosRoute
   '/help': typeof AuthenticatedHelpRoute
   '/profile': typeof AuthenticatedProfileRoute
   '/settings': typeof AuthenticatedSettingsRoute
@@ -369,6 +376,7 @@ export interface FileRoutesByFullPath {
 }
 export interface FileRoutesByTo {
   '/login': typeof LoginRoute
+  '/pos': typeof PosRoute
   '/help': typeof AuthenticatedHelpRoute
   '/profile': typeof AuthenticatedProfileRoute
   '/settings': typeof AuthenticatedSettingsRoute
@@ -417,6 +425,7 @@ export interface FileRoutesById {
   __root__: typeof rootRouteImport
   '/_authenticated': typeof AuthenticatedRouteWithChildren
   '/login': typeof LoginRoute
+  '/pos': typeof PosRoute
   '/_authenticated/help': typeof AuthenticatedHelpRoute
   '/_authenticated/profile': typeof AuthenticatedProfileRoute
   '/_authenticated/settings': typeof AuthenticatedSettingsRoute
@@ -467,6 +476,7 @@ export interface FileRouteTypes {
   fullPaths:
     | '/'
     | '/login'
+    | '/pos'
     | '/help'
     | '/profile'
     | '/settings'
@@ -513,6 +523,7 @@ export interface FileRouteTypes {
   fileRoutesByTo: FileRoutesByTo
   to:
     | '/login'
+    | '/pos'
     | '/help'
     | '/profile'
     | '/settings'
@@ -560,6 +571,7 @@ export interface FileRouteTypes {
     | '__root__'
     | '/_authenticated'
     | '/login'
+    | '/pos'
     | '/_authenticated/help'
     | '/_authenticated/profile'
     | '/_authenticated/settings'
@@ -609,10 +621,18 @@ export interface FileRouteTypes {
 export interface RootRouteChildren {
   AuthenticatedRoute: typeof AuthenticatedRouteWithChildren
   LoginRoute: typeof LoginRoute
+  PosRoute: typeof PosRoute
 }
 
 declare module '@tanstack/react-router' {
   interface FileRoutesByPath {
+    '/pos': {
+      id: '/pos'
+      path: '/pos'
+      fullPath: '/pos'
+      preLoaderRoute: typeof PosRouteImport
+      parentRoute: typeof rootRouteImport
+    }
     '/login': {
       id: '/login'
       path: '/login'
@@ -1069,6 +1089,7 @@ const AuthenticatedRouteWithChildren = AuthenticatedRoute._addFileChildren(
 const rootRouteChildren: RootRouteChildren = {
   AuthenticatedRoute: AuthenticatedRouteWithChildren,
   LoginRoute: LoginRoute,
+  PosRoute: PosRoute,
 }
 export const routeTree = rootRouteImport
   ._addFileChildren(rootRouteChildren)

packages/admin/src/routes/_authenticated.tsx

@@ -8,7 +8,7 @@ import { myPermissionsOptions } from '@/api/rbac'
 import { moduleListOptions } from '@/api/modules'
 import { Avatar } from '@/components/shared/avatar-upload'
 import { Button } from '@/components/ui/button'
-import { Users, UserRound, HelpCircle, Shield, UserCog, LogOut, User, Wrench, Package, ClipboardList, FolderOpen, KeyRound, Settings, PanelLeftClose, PanelLeft, CalendarDays, GraduationCap, CalendarRange, BookOpen, BookMarked, Package2, Tag, Truck } from 'lucide-react'
+import { Users, UserRound, HelpCircle, Shield, UserCog, LogOut, User, Wrench, Package, ClipboardList, FolderOpen, KeyRound, Settings, PanelLeftClose, PanelLeft, CalendarDays, GraduationCap, CalendarRange, BookOpen, BookMarked, Package2, Tag, Truck, ShoppingCart } from 'lucide-react'
 
 export const Route = createFileRoute('/_authenticated')({
   beforeLoad: () => {
@@ -145,6 +145,7 @@ function AuthenticatedLayout() {
   const canViewLessons = !permissionsLoaded || hasPermission('lessons.view')
   const canViewInventory = !permissionsLoaded || hasPermission('inventory.view')
   const canViewUsers = !permissionsLoaded || hasPermission('users.view')
+  const canViewPOS = !permissionsLoaded || hasPermission('pos.view')
 
   const [collapsed, setCollapsed] = useState(false)
 
@@ -173,6 +174,11 @@ function AuthenticatedLayout() {
 
           {/* Scrollable nav links */}
           <div className="flex-1 overflow-y-auto px-2 space-y-1 scrollbar-thin">
+            {isModuleEnabled('pos') && canViewPOS && (
+              <div className="mb-2">
+                <NavLink to="/pos" icon={<ShoppingCart className="h-4 w-4" />} label="Point of Sale" collapsed={collapsed} />
+              </div>
+            )}
             {canViewAccounts && (
               <NavGroup label="Customers" collapsed={collapsed}>
                 <NavLink to="/accounts" icon={<Users className="h-4 w-4" />} label="Accounts" collapsed={collapsed} />

packages/admin/src/routes/pos.tsx

@@ -0,0 +1,21 @@
+import { createFileRoute, redirect } from '@tanstack/react-router'
+import { useAuthStore } from '@/stores/auth.store'
+import { POSRegister } from '@/components/pos/pos-register'
+
+export const Route = createFileRoute('/pos')({
+  beforeLoad: () => {
+    const { token } = useAuthStore.getState()
+    if (!token) {
+      throw redirect({ to: '/login' })
+    }
+  },
+  component: POSPage,
+})
+
+function POSPage() {
+  return (
+    <div className="h-screen w-screen overflow-hidden bg-background text-foreground">
+      <POSRegister />
+    </div>
+  )
+}

packages/admin/src/stores/pos.store.ts

@@ -0,0 +1,21 @@
+import { create } from 'zustand'
+
+interface POSState {
+  currentTransactionId: string | null
+  locationId: string | null
+  drawerSessionId: string | null
+  setTransaction: (id: string | null) => void
+  setLocation: (id: string) => void
+  setDrawerSession: (id: string | null) => void
+  reset: () => void
+}
+
+export const usePOSStore = create<POSState>((set) => ({
+  currentTransactionId: null,
+  locationId: null,
+  drawerSessionId: null,
+  setTransaction: (id) => set({ currentTransactionId: id }),
+  setLocation: (id) => set({ locationId: id }),
+  setDrawerSession: (id) => set({ drawerSessionId: id }),
+  reset: () => set({ currentTransactionId: null }),
+}))