feat(mesh): add HSL color interpolation space

[MrNihalT]

Summary

Hey! This PR adds support for HSL (Hue, Saturation, Lightness) color space blending to the gradient editor.

Why

Currently, if you try to blend opposite colors (like blue and yellow) in RGB or Linear space, the math cuts straight through the color cube and creates a dull, muddy grey or brown area in the middle of the transition.

Related issue

Closes #

Type of change

• Feature (feat)
• Bug fix (fix)
• Performance (perf)
• Refactor / chore
• Docs
• Breaking change

How was this tested?

• Ran pnpm check locally—TypeScript compiles, lint checks pass, and the production static build generated successfully without issues.
• Fired up the dev server (pnpm dev) and manually checked it in Chrome. Selecting HSL blending renders smoothly and looks incredibly vibrant!

Checklist

• pnpm check passes locally
• I added or updated tests where appropriate, or explained why none are needed
• I updated documentation where appropriate, or this change needs no docs
• Verified the change in the running app
• Self-reviewed the diff
• This PR contains no secrets, credentials, or unrelated changes

Screenshots / recordings

Notes for reviewers

• The circular projection logic is handled in lib/color.ts and the GLSL math is in shaders/meshPass.ts. Feel free to review the conversion steps!

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