Feature: Implement a real-time calendar calendar integration for Whit…

[pradeep0153]

Closes #399.

Description

This PR executes a massive operational upgrade to our fulfillment pipeline by engineering an automated, real-time "White Glove Delivery" scheduling system directly into the checkout flow, replacing the highly inefficient, manual callback process.

Changes Made

• Component Architecture: Engineered a highly interactive, dynamic <DeliveryScheduler /> React component, seamlessly injected as a mandatory final step within the /checkout routing funnel (for large, freight-class items).
• Logistics API Integration: Orchestrated a robust, real-time integration with our primary third-party logistics (3PL) routing API (e.g., Ryder or XPO Logistics).
• Dynamic Routing Queries: When the customer proceeds to the shipping step and enters their destination zip code, the backend now instantly dispatches a query to the 3PL API, requesting active routing availability for that specific geolocation.
• Calendar Visualization: The component parses the complex API response and renders an elegant, interactive calendar UI. It empowers the customer to visually browse and lock in their exact preferred 4-hour delivery window (e.g., "Tuesday, 8 AM - 12 PM") before they finalize the transaction and enter their credit card.

Impact

• Operational Efficiency & Customer Experience: Previously, buying a large sofa resulted in a disjointed, anxiety-inducing experience: the customer paid $4,000, and checkout simply stated, "We will call you to schedule delivery." This forced our support team into a manual, endless loop of phone tag, creating massive operational overhead. By engineering this direct, real-time API integration, we completely automate the logistics pipeline. We provide the customer with absolute certainty and control over their delivery schedule immediately at the point of purchase, providing a world-class, premium checkout experience and drastically reducing the burden on our internal support infrastructure.

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