feat: enhance swap logic and refactor tests

[techvoyagerX]

Description

This PR introduces enhancements and refactors to the swap logic and associated tests for improved clarity, maintainability, and functionality. Key changes include:

• Account Setup Refactor: Modularized and reused account setup logic for both swap directions.
• Fee Handling: Introduced a TAKER_FEE constant to centralize and simplify fee-related logic.
• Balance Verification Helper: Added a withBalanceChange utility function to streamline and improve test readability.
• Expanded Test Cases: Improved coverage for various swap scenarios:
  • Swapping between USDC and Token A.
  • Swapping between Token A and Token B (transitive swaps).
  • Added detailed assertions for balance changes and expected results.
• Code Readability: Cleaned up inline comments and variable naming to enhance code clarity.

[vercel]

@techvoyagerX is attempting to deploy a commit to the coral-xyz Team on Vercel.

A member of the Team first needs to authorize it.