Add Pigments extension

[JonathonRP]

Summary

Adds Pigments, a language-server extension providing native Zed document-color previews.

• Registry ID: pigments-lsp
• Version: 0.3.1
• Extension path: zed-pigments
• Pinned source commit: 545ee63
• Release: v0.3.1

Existing extensions and differentiation

This overlaps with the document-color use case served by Color Highlight and the narrower hex-colorizer submission in #7456. Pigments is based on ColorLSP and preserves attribution, but materially expands the behavior:

• language-aware, context-aware parsing rather than matching every hex-looking token
• CSS hex (including #RGBA), 0x, RGB/HSL, CSS Color 4 (hwb, lab, lch, oklab, and oklch), and safe named-color recognition
• recursive document-local CSS custom-property and Sass/Less/Stylus variable resolution, with scope and cycle safeguards
• UTF-16-correct LSP ranges
• hover details and style-preserving colorPresentation edits

The source README documents the supported syntax, semantic safeguards, limitations, attribution, and architecture.

Validation

• pnpm sort-extensions

• pnpm build

• pnpm test (115 tests)

• pnpm package-extensions pigments-lsp using the upstream Linux packaging environment: Node 24, Rust 1.90, wasm32-wasip2, and pinned zed-extension CLI 9ee3c503a4bbbc6b4a0f8a789acca4871d773223

• Confirmed the pinned commit remains reachable from the source repository's main history and publication branch

• I've read the contribution guidelines and followed the relevant guidance for adding or updating my extension.

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[JonathonRP]

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