fix: require open drawer to complete transactions, fix product price field

- Backend enforces open drawer at location before completing any transaction
- Frontend disables payment buttons when drawer is closed with warning message
- Fix product price field name (price, not sellingPrice) in POS API types
- Fix seed UUIDs to use valid UUID v4 format (version nibble must be 1-8)
- Fix Vite allowedHosts for dev.lunarfront.tech access
- Add e2e test for drawer enforcement (39 POS tests now pass)

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

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

@@ -48,11 +48,12 @@ export function POSItemPanel({ transaction }: POSItemPanelProps) {
         productId: product.id,
         description: product.name,
         qty: 1,
-        unitPrice: parseFloat(product.sellingPrice ?? '0'),
+        unitPrice: parseFloat(product.price ?? '0'),
       })
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId ?? '') })
+      const txnId = usePOSStore.getState().currentTransactionId
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(txnId ?? '') })
     },
     onError: (err) => toast.error(err.message),
   })
@@ -76,7 +77,8 @@ export function POSItemPanel({ transaction }: POSItemPanelProps) {
       })
     },
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: posKeys.transaction(currentTransactionId ?? '') })
+      const txnId = usePOSStore.getState().currentTransactionId
+      queryClient.invalidateQueries({ queryKey: posKeys.transaction(txnId ?? '') })
       setCustomOpen(false)
       setCustomDesc('')
       setCustomPrice('')
@@ -102,7 +104,7 @@ export function POSItemPanel({ transaction }: POSItemPanelProps) {
         productId: product.id,
         description: product.name,
         qty: 1,
-        unitPrice: parseFloat(product.sellingPrice ?? '0'),
+        unitPrice: parseFloat(product.price ?? '0'),
       })
     },
     onSuccess: () => {
@@ -158,7 +160,7 @@ export function POSItemPanel({ transaction }: POSItemPanelProps) {
               >
                 <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">${parseFloat(product.sellingPrice ?? '0').toFixed(2)}</span>
+                  <span className="text-base font-semibold">${parseFloat(product.price ?? '0').toFixed(2)}</span>
                   {product.sku && <span className="text-xs text-muted-foreground">{product.sku}</span>}
                 </div>
                 {product.isSerialized ? (