feat: implement advanced shopping cart engine with dynamic promo calculation and persistent state - #418
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…ulation and persistent state
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Related Issue
Closes #417
Summary
Implements a modular Shopping Cart & Dynamic Order Calculation Engine for Furnix storefront, complete with promo code validation, tax estimation, threshold shipping, and clean state persistence.
Changes Made
scripts/cart-calculator.jsfor pure math, currency formatting, and coupon rules (FURNIX10,ECSOC2026).scripts/cart-engine.jsfor item management, quantity safety bounds (1-99), and custom event dispatching.cart.htmlwith interactive promo code input and order summary breakdown.app.jsandstyle.cssfor event handling and promo styling.Furnix-main/cart.htmlfile.Testing
node -e "const calc = require('./scripts/cart-calculator.js'); ...").Impact
Improves storefront reliability, user engagement, and e-commerce cart management.
Checklist