Refactor tile set size shared functionality into a hook

[plasticviking]

useTileSizeThresholds(size: number) computes both color-based thresholds and whether size exceeds download limit. moves duplicated functionality into a single reusable hook. Move associated constants into a separate file for findability.

Overview

This PR includes the following proposed change(s):

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Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Refactoring / Documentation
• [ ] Version change

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How Has This Been Tested?

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Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] New and existing unit tests pass locally with my changes

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

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