Add babel-plugin-react-compiler to the build pipeline to enable
automatic memoization and optimization of React components.

#skip-bugbot

<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Enable React Compiler in the renderer Vite build to automatically
memoize and optimize React components. This should reduce unnecessary
re-renders and improve UI responsiveness.

- **Dependencies**
- Added babel-plugin-react-compiler and wired it into
@vitejs/plugin-react via Babel (default config).

- **Migration**
- No code changes required; build-time only. Verify key UI flows for any
unexpected behavior.

<sup>Written for commit 64fdea33436212d3ba36aa60e5ca014eaf2ab3e5.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->
Co-authored-by: Claude <noreply@anthropic.com>