feat(ui): implement dark mode delivery, escrow checkout, and unified …

[rexx010]

Summary

This PR implements the requested Figma dark-mode UI designs across the SwiftChain frontend, covering the escrow payment checkout flow, new delivery creation steps, and global unified search.

Implemented

• Implemented the Escrow Payment Checkout System (Stellar/USDC) dark-mode interface.
• Implemented New Delivery — Sender & Receiver Details (Step 1).
• Implemented New Delivery — Cargo Type & Dimensions (Step 2).
• Implemented the Global Unified Search interface for deliveries, drivers/users, and transactions.
• Updated the required routes for the new screens and flows.
• Applied the specified dark-mode color variables and appropriate contrast.
• Implemented responsive layouts for desktop and mobile viewports.
• Matched the implemented interfaces with the provided Figma specifications.

Validation

• Tested the implemented screens locally.
• Verified responsive behavior across desktop and mobile viewports.
• Checked dark-mode styling, contrast, spacing, and component consistency.
• Verified that the changes do not introduce visual or functional regressions.

Issues

Closes:

• [Figma] Design Dark Mode: Escrow Payment Checkout System (Stellar/USDC)
• [Figma] Design Dark Mode: New Delivery - Cargo Type & Dimensions (Step 2)
• [Figma] Design Dark Mode: New Delivery - Sender & Receiver Details (Step 1)
• [Figma] Design Dark Mode: Global Unified Search (Deliveries, Drivers, Transactions)

Closes #458
Closes #459
Closes #460
Closes #461