feat: add MKT tab and integrate profitability dashboard

components/mkt/utils.ts

@@ -0,0 +1,48 @@
+import { Product } from './types';
+import { clsx, type ClassValue } from 'clsx';
+import { twMerge } from 'tailwind-merge';
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs));
+}
+
+export const formatCurrency = (value: number) => {
+  return new Intl.NumberFormat('en-US', {
+    style: 'currency',
+    currency: 'USD',
+    minimumFractionDigits: 0,
+    maximumFractionDigits: 0,
+  }).format(value);
+};
+
+export const formatPercent = (value: number) => {
+  return new Intl.NumberFormat('en-US', {
+    style: 'percent',
+    minimumFractionDigits: 1,
+    maximumFractionDigits: 1,
+  }).format(value);
+};
+
+export const calculateProductMetrics = (product: Product, includeCOGS: boolean) => {
+  const incentives = product.deals + product.promos;
+  const cogsDeduction = includeCOGS ? product.cogs : 0;
+  const totalDeductions = product.ppcSpend + incentives + product.chargebacks + cogsDeduction;
+  const netMargin = product.grossSales - totalDeductions;
+  const marginPercent = product.grossSales > 0 ? netMargin / product.grossSales : 0;
+  const acos = product.grossSales > 0 ? product.ppcSpend / product.grossSales : 0;
+  
+  const chargebackIncrease = product.chargebacksPrevMonth > 0 
+    ? (product.chargebacks - product.chargebacksPrevMonth) / product.chargebacksPrevMonth 
+    : 0;
+  const hasChargebackAnomaly = chargebackIncrease > 0.15;
+
+  return {
+    incentives,
+    totalDeductions,
+    netMargin,
+    marginPercent,
+    acos,
+    chargebackIncrease,
+    hasChargebackAnomaly
+  };
+};