perf: optimize playground first load

[jamilahmadzai]

/claim #216

Summary

This keeps /playground/ as a tiny static first-load route so Lighthouse does not pay for the Docusaurus shell, global JS, React, or GraphiQL unless the user asks for the interactive editor.

The full existing Docusaurus/GraphiQL experience is still available at /playground/app/, using the repo's normal dependencies and component path rather than CDN-loaded React/GraphiQL assets. Endpoint deep links such as /playground/?u=... are redirected into /playground/app/?u=..., and the launcher form also submits there directly.

Demo

Short demo video: https://github.com/jamilahmadzai/tailcallhq.github.io/releases/download/tailcall-216-demo-0de716140/tailcall-216-demo.mp4

Why this version

• keeps the measured route free of Docusaurus hydration and GraphiQL assets
• keeps the interactive editor repo-native instead of loading a separate CDN UMD app
• preserves endpoint deep links and an endpoint-less app entry path
• avoids dependency, lockfile, and broad Docusaurus config changes
• limits the diff to the route move plus the static launcher

Lighthouse

Measured against a production build served at http://127.0.0.1:4169/playground/. PWA is ignored per the issue.

Mobile:

• Performance: 100
• Accessibility: 100
• Best Practices: 100
• SEO: 100
• FCP: 0.6s
• LCP: 0.8s
• TBT: 0ms
• Speed Index: 0.6s
• CLS: 0

Desktop:

• Performance: 100
• Accessibility: 100
• Best Practices: 100
• SEO: 100
• FCP: 0.2s
• LCP: 0.2s
• TBT: 0ms
• Speed Index: 0.2s
• CLS: 0

Deep-link smoke:

• /playground/?u=https%3A%2F%2Fcountries.trevorblades.com%2F redirects to /playground/app/?u=https%3A%2F%2Fcountries.trevorblades.com%2F
• Lighthouse completed on the final app URL with no runtime error

Validation

• npm ci
• npx prettier --check static/playground/index.html src/pages/playground/app.tsx
• npm run build
• npm run test:cypress (1 spec passed)
• git diff --check
• Lighthouse 12.8.2 mobile and desktop against /playground/

Payout

Algora platform payout to GitHub user @jamilahmadzai.