refactor: use switch case instead

src/utils/arithmetic.ts

@@ -55,9 +55,12 @@ export function calculatePrice(
   // Calculate before VAT
   const beforeVat = vatIncluded ? precisionRound(price / (1 + vat)) : price;
 
-  // Return based on output selection
-  if (output === 'vat') return calculatedVat;
-  if (output === 'total') return total;
-  if (output === 'beforeVat') return beforeVat;
-  return 0;
+  switch (output) {
+    case 'vat':
+      return calculatedVat;
+    case 'total':
+      return total;
+    case 'beforeVat':
+      return beforeVat;
+  }
 }