feat: add hexagon entity type and hook

[wakka810]

Adds a new Hexagon entity type and its color constant.

[Copilot]

Pull request overview

This PR adds support for a new hexagon entity type to the game's entity management system. The changes introduce the Hexagon entity type alongside its distinctive color (#35c5db) and implements a polygon hook to detect and track hexagon entities rendered on screen.

Key Changes:

• Added Hexagon enum value to EntityType and corresponding color to EntityColor
• Implemented #hexagonHook() method that detects hexagons with radius 100 using a 6-sided polygon hook

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/types/entity.ts	Adds Hexagon to EntityType enum and EntityColor enum with cyan color value
src/extensions/entity_manager.ts	Implements hexagon detection hook following existing polygon hook pattern

The implementation is clean and follows the established patterns in the codebase. The hexagon hook is consistent with the existing triangle, square, and pentagon hooks in structure and logic. No issues were identified during the review.

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[Cazka]

thanks for the contribution! looks great.