feat(demo): Netflix-skinned demo for managed-auth-react

[dprevoznik]

Summary

• New `packages/netflix-demo` Vite app that wraps `` in a Netflix-style backdrop (red bloom, black gradient, Bebas Neue wordmark).
• Two modes:
  • Preview (default) — state picker scrubs through every UI step (`prime`, `discovering`, `awaiting_input`, `success`, `error`, etc.) under the Netflix appearance. No backend required.
  • Live — pass `?session=&code=` to render the all-in-one component against a real connection.
• Theming lives in `src/netflixAppearance.ts` as pure data — lift directly into a customer app.

Run

```bash
bun install
bun run --filter @onkernel/managed-auth-react-netflix-demo dev
```
Opens at http://localhost:5174.

Test plan

• `bun run typecheck` clean across the workspace
• `bun run --filter @onkernel/managed-auth-react-netflix-demo build` succeeds
• Vite dev server boots and serves the page
• Visual sanity check across every preview state
• Live mode with a real `session` + `code` from the Kernel SDK

🤖 Generated with Claude Code