Phase 1: Remove obsolete files and standardize all pages

- Standardize script loading on faq, privacy, returns, shipping-info pages
- Archive 14 unused JS files (cart-functions, shopping, cart.js, enhanced versions, etc.)
- Archive 2 unused CSS files (responsive-enhanced, responsive-fixes)
- All pages now use consistent script loading order
- Eliminated shopping.js dependency (not needed after standardization)

website/public/assets/js/archive/error-handler.js

@@ -0,0 +1,63 @@
+/**
+ * Frontend Error Handler
+ * Centralized error handling and logging
+ */
+
+(function () {
+  "use strict";
+
+  class ErrorHandler {
+    constructor() {
+      this.errors = [];
+      this.maxErrors = 100;
+      this.productionMode = window.location.hostname !== "localhost";
+    }
+
+    log(context, error, level = "error") {
+      const errorEntry = {
+        timestamp: new Date().toISOString(),
+        context,
+        message: error?.message || error,
+        level,
+        stack: error?.stack,
+      };
+
+      this.errors.push(errorEntry);
+      if (this.errors.length > this.maxErrors) {
+        this.errors.shift();
+      }
+
+      // Only log to console in development
+      if (!this.productionMode && level === "error") {
+        console.error(`[${context}]`, error);
+      } else if (!this.productionMode && level === "warn") {
+        console.warn(`[${context}]`, error);
+      }
+    }
+
+    getErrors() {
+      return [...this.errors];
+    }
+
+    clearErrors() {
+      this.errors = [];
+    }
+  }
+
+  // Global error handler
+  window.ErrorHandler = window.ErrorHandler || new ErrorHandler();
+
+  // Global error event handler
+  window.addEventListener("error", (event) => {
+    window.ErrorHandler.log(
+      "GlobalError",
+      event.error || event.message,
+      "error"
+    );
+  });
+
+  // Unhandled promise rejection handler
+  window.addEventListener("unhandledrejection", (event) => {
+    window.ErrorHandler.log("UnhandledRejection", event.reason, "error");
+  });
+})();