PR Description

Summary

This PR introduces new custom errors for the LiquidityManager contract and makes adjustments to its function parameters for improved clarity and safety.

What's New

• Custom Errors Added

  • LiquidityManager__InvalidAmount
  • LiquidityManager__InsufficientLiquidity
  • LiquidityManager__ThresholdAlreadyMet
  • LiquidityManager__VestingAlreadySet

• LiquidityManager Updates

  • Cleaned up unused parameters in addLiquidity.
  • Improved readability and developer feedback through structured error handling.

Why

Using custom errors reduces gas costs compared to require strings and provides more descriptive, explicit failure cases.
Refactoring LiquidityManager ensures safer liquidity operations and improves code maintainability.

Checklist

• Added four new custom errors
• Updated LiquidityManager function signatures
• Improved contract clarity and error handling

Closes #<issue_number_if_any>