feat: add shadcn-cssinjs CLI package

[Aniket-508]

Stack

Depends on #7. Review this PR against codex/monorepo-separation; after #7 merges, this PR can be retargeted to main.

What changed

• added the packages/shadcn-cssinjs CLI package with shadcn-compatible init, add, search, view, docs, info, registry build, and MCP commands
• added automatic StyleX setup for existing and newly scaffolded Next.js and Vite React projects
• added the StyleX engine abstraction with Tokenami and Panda CSS extension points
• switched the website to the workspace CLI for registry generation
• migrated the Next.js integration to the official StyleX unplugin so SWC and next/font remain supported
• updated the website, generated registry, schema, MCP setup, and documentation for shadcn-cssinjs

Why

StyleX setup previously required consumers to configure the compiler and registry manually. Owning the CLI provides a shadcn-like installation flow now and a dedicated place for Tokenami and Panda CSS setup later.

Impact

Consumers can initialize StyleX and install source-owned components with:

pnpm dlx shadcn-cssinjs@latest init
pnpm dlx shadcn-cssinjs@latest add button

Validation

• pnpm check
• pnpm run typecheck
• pnpm build
• clean Next.js fixture: real init and add button
• npm package dry run

The rewritten branch has the exact same file tree as the previously validated PR #6 head; only its parent and commit boundary changed.

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Project	Deployment	Actions	Updated (UTC)
shadcn-cssinjs	Ready	Preview, Comment	Jul 13, 2026 6:29am