✨ [UI/UX] Modularize combos and build dashboard UI

[Harshraj979]

Overview

This PR resolves several open issues by modularizing the recommendations engine and building out a fully functional, premium Account Dashboard.

Changes Made

• Verified Fixes: Confirmed that the missing invoice script, duplicate imports, and broken favicon paths were already addressed in the codebase.
• Smart Combos Modularization:
  • Refactored recommendations.html to remove ~150 lines of duplicated inline scripts and properly imported the modular engine from js/recommendations.js.
  • Integrated the Smart Combos recommendation widget directly onto the menu.html page to provide dynamic side-item suggestions based on cart contents.
• Account Dashboard Features:
  • Replaced the static "Coming Soon" placeholder on dashboard.html with a fully functional UI.
  • Built a new dashboard.css stylesheet for premium styling.
  • Added dynamic stat cards (Total Orders, Loyalty Points, Cart Items).
  • Added a recent order history list and a functional form for saving/updating the default delivery address.

Testing Done

• Verified menu.html recommendations widget dynamically updates when items are added to the cart.
• Verified dashboard stats correctly load from localStorage and sessionStorage.
• Checked mobile responsiveness for the new dashboard components and ensured zero console errors.