Add solid-lang runtime package for OpenUI

[nizarfadlan]

What

Add first-class SolidJS support to OpenUI with a new @openuidev/solid-lang package, plus a complete examples/solid-chat app to demonstrate real-world usage.

This PR now covers both:

1. Solid runtime/library support
2. A working SolidJS chat dashboard example with streaming OpenUI rendering

Changes

• Add new package: @openuidev/solid-lang
  • Component/library APIs: defineComponent, createLibrary
  • Solid renderer: Renderer
  • Context helpers for component authors
  • Form validation helpers and re-exports
  • Lang-core parser/action/runtime type re-exports
• Add package tooling/config:
  • tsconfig.json, tsconfig.test.json
  • vite.config.ts (Vitest + Solid plugin)
  • eslint.config.cjs
  • package.json scripts and deps
• Add tests:
  • src/__tests__/library.test.ts
  • src/__tests__/validation.test.ts
  • src/__tests__/Renderer.test.tsx
• Add package docs:
  • packages/solid-lang/README.md
• Update repo docs:
  • Add @openuidev/solid-lang to package table and repo structure in README.md
• Update publish workflow:
  • Add solid-lang option in .github/workflows/publish-npm-package.yml
• Update lockfile:
  • pnpm-lock.yaml

Add SolidJS example app

• Add examples/solid-chat with:
  • Solid + Vite app wired to @openuidev/solid-lang
  • OpenUI component library (Card, Chart, KpiTile, MetricList, Timeline, Badge, etc.)
  • Prompt generation script and generated system prompt
  • Dev middleware chat endpoint (/api/chat) for OpenAI-compatible streaming
  • Streaming UX improvements:
    • loading state before valid UI tokens
    • client-side recovery/sanitization for noisy model output
  • Dashboard layout and chart rendering improvements to prevent clipping
  • Example docs and env setup (README.md, .env.example)

Repo-level updates

• Update root README.md to include @openuidev/solid-lang and examples/solid-chat
• Update publish workflow to include solid-lang
• Update pnpm-lock.yaml

Test Plan

Validated locally:

solid-lang package

• pnpm --filter @openuidev/solid-lang test
• pnpm --filter @openuidev/solid-lang run ci
• pnpm --filter @openuidev/solid-lang build

solid-chat example

• pnpm --filter solid-chat generate:prompt
• pnpm --filter solid-chat build

All commands pass.

• Verified locally

Checklist

• I linked a related issue, if applicable
• I updated docs/README when needed
• I considered backwards compatibility

[zahlekhan]

Thanks for PR. We have assigned a reviewer.

[nizarfadlan]

Update posted on this PR: the SolidJS work is now expanded beyond @openuidev/solid-lang package support and includes a full examples/solid-chat demo app with real streaming chat + dashboard rendering.

I’ve also updated the PR title/body to reflect this broader scope.
I’ll add UI screenshots in a follow-up comment so reviewers can quickly verify visual output.