Add rental price and replacement cost to item details

Extended the item details view to include rental price and replacement cost. This provides more comprehensive information for users managing inventory items.

barkmanui/src/features/inventory/ItemDetail.tsx

@@ -36,6 +36,8 @@ if (error) return 'An error has occurred: ' + error.message
             <Text>Name: {data.name}</Text>
             <Text>Status: {data.status}</Text>
             <Text>Serial Number: {data.serialNumber}</Text>
+            <Text>Rental Price: ${data.rentalPrice}</Text>
+            <Text>Replacement Cost: ${data.replacementCost}</Text>
             <Text>Notes: {data.notes}</Text>