Replace internal color implementation with marangi

[waynemwashuma]

Objective

Refactors @wimaengine/color to use the standalone marangi package as its underlying color implementation, reducing code duplication and centralizing color utilities.

Solution

Why This Approach

This solution was chosen because:

• It establishes Marangi as the single source of truth for color manipulation.
• It reduces duplicated code between Wima Engine and the standalone package.
• It allows color utilities to be developed and maintained independently.
• Re-exporting Marangi preserves the existing @wimaengine/color import path.

Showcase

N/A

Migration Guide

No migration is required.

Checklist

• I have updated the documentation accordingly.
• I have added tests to cover my changes.