Motivation

• Provide a drop-in Radix-themed token source that converts Radix tokens into PUI --p-* HSL triplet variables so PUI can consume Radix themes at build time.
• Vendor the minimal Radix token/component CSS to ensure deterministic local generation and enable dark/light + accent scopes without remote dependencies.
• Port a small set of Radix surface components (button, input, textarea, dialog) to PUI attribute selectors to unlock visual parity for core controls.

Description

• Add a new package packages/pui-theme-radix with package.json, postcss.config.cjs, and npm scripts build:tokens, build:css, and build to run the token generator and PostCSS build.
• Implement a token pipeline: src/build/gen-tokens.mjs (PostCSS bundle -> virtual CSS var resolver -> composite alpha over background -> HSL triplet converter) and an editable src/build/token-map.json that maps Radix variables to PUI --p-* outputs.
• Vendor Radix sources under src/radix-src/ (tokens, colors, components and _internal pieces) and add a src/build/css/radix-entry.css entry used by the generator.
• Produce src/generated/tokens.css from the generator and stitch the theme in src/index.css, and add PUI-ported component styles in src/components/ for button, input, textarea, and dialog following the selector/variant mapping rules.
• Small runtime/tooling fixes: added white/black parsing to the generator's parseColor to handle CSS keywords; updated workspace (pnpm-workspace.yaml) and lockfile to include the new package and PostCSS dev deps.

Testing

• pnpm install was executed for the workspace and completed successfully, installing the new PostCSS/tooling dev dependencies for the theme package.
• Executed the token generator with node packages/pui-theme-radix/src/build/gen-tokens.mjs; the first run exposed a color parsing edge-case (CSS keywords) and after a small parsing fix the generator re-ran successfully and emitted packages/pui-theme-radix/src/generated/tokens.css.
• postcss build (pnpm --filter @pui/theme-radix run build:css) was not executed in this rollout; the package contains the PostCSS wiring and postcss devDependencies to run that step in CI or locally.

Codex Task