Add initial SSR support for LiveProvider previews

[tujoworker]

Summary

Adds server-side rendering (SSR) support for LiveProvider, allowing previews to render during the initial server render pass instead of being empty until client-side hydration.

Changes

• LiveProvider.tsx: Refactored state initialization so that when useState runs (including on the server), it synchronously transpiles the provided code and produces an element — enabling LivePreview to render meaningful content in renderToString / renderToStaticMarkup.
• transpile/index.ts: Minor adjustment to support the SSR transpilation path.
• LiveProvider.ssr.test.js: New test suite covering inline previews, noInline previews, synchronous transformCode, and the async transformCode deferred case.
• Docs (api.md, usage.md): Updated to document SSR behavior and usage.

Behavior

Scenario	SSR output
Inline code	Rendered preview
noInline with render()	Rendered preview
Synchronous transformCode	Rendered preview
Async transformCode	Empty preview (deferred to client)