🧭 Mini-Map Overlay

[NickTheDevOpsGuy]

Description

Add small preview of full board showing snake + food positions.
Goal: multiple canvas layers + coordinate scaling.
Test: mini-map updates in sync with main game.

Proposed Solution

No response

Screenshots / Mockups (optional)

No response

Additional Context

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Checklist

• I searched existing issues for duplicates
• This issue includes enough detail to act on