add web file headers

web/context/CartContext.js

@@ -1,3 +1,10 @@
+/*
+ * Provides shopping cart state and actions like add, remove, and checkout.
+ *
+ * Author: Shiv
+ * Date: April 2026
+ */
+
 "use client";
 
 import { createContext, useContext, useState, useEffect, useCallback } from "react";