feat(react): add Batch component for concurrent multi-video rendering

[caffeinum]

Summary

• adds <Batch> wrapper component to render multiple videos with concurrency control
• supports parallel prop for concurrent renders (default: 1)
• fail-fast behavior - first error stops the batch
• each <Render> child uses name prop for output filename

Usage

<Batch parallel={4} output="output/hooks">
  {HOOKS.map((hook) => (
    <Render key={hook} name={hook.toLowerCase().replace(/\s+/g, "-")}>
      <Clip duration={5}>
        <Video prompt={hook} />
      </Clip>
    </Render>
  ))}
</Batch>

Changes

• src/react/types.ts - added batch type, BatchProps, name to RenderProps
• src/react/elements.ts - added Batch() function
• src/react/renderers/batch.ts - new renderer with chunked concurrency
• src/react/render.ts - exports renderBatch
• src/react/index.ts - exports Batch, BatchProps, renderBatch, BatchResult
• src/cli/commands/render.tsx - handles batch in cli
• src/react/examples/batch-demo.tsx - example file

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/batch-render

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[caffeinum]

@SecurityQQ check this out