Design: complete high-fidelity dark mode landing page sections

[EzeanoroEbuka]

Closes #229
Closes #230, Closes #231, Closes #232

Summary of Design Work

This PR introduces the complete high-fidelity Dark Mode design for the Landing Page, structured with responsive auto-layout, consistent typography, and reusable Figma components.

Sections Completed:

• Hero Section (Design Dark Mode: High-Fidelity Landing Page Hero Section #229): Top navigation (logo, 'Get Started'), main hero copy, protocol stats counters, and primary CTAs ('Secure Your Shipment', 'Explore The Explorer').
• Live Stats & Trust Bar (Design Dark Mode: High-Fidelity Landing Page Live Stats & Trust Bar #230): Live protocol stats container and the 'Securing transactions...' trust bar featuring 5 blockchain logos.
• Network Pathways (Design Dark Mode: High-Fidelity Landing Page Network Pathways #231): 'Architected for Scale' header and the two primary pathway cards ('Logistics Enterprises' and 'Independent Carriers') with custom iconography.
• Core Value Prop Cards (Design Dark Mode: High-Fidelity Landing Page Core Value Prop Cards #232): 3-card grid (Trustless Escrow, Instant Settlement, Zero-Fee Layer) with custom security, lightning, and cash icons.

Figma Design Link

[Insert Figma Link Here]

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