feat: add seed support for image, video, and music generation

[caffeinum]

Summary

Adds seed prop support across all media generation to enable reproducible results.

• Add seed?: number to React components (<Image seed={...}>, <Video seed={...}>, <Music seed={...}>)
• Update renderers to pass seed to generate functions
• Extend MusicModelV3CallOptions to include seed parameter

Provider Support

Provider	Image	Video	Music
FAL	✅ Already supported	✅ LTX-2 + WAN models	N/A
Google	⚠️ Warning (unsupported)	✅ Veo models	N/A
Together	✅ Already supported	N/A	N/A
Higgsfield	✅ Now supported	N/A	N/A
OpenAI	N/A	⚠️ Warning (Sora unsupported)	N/A
ElevenLabs	N/A	N/A	⚠️ Warning (unsupported)

Usage

// React components
<Image 
  prompt="a sunset over mountains" 
  model={fal.imageModel("flux-schnell")}
  seed={42}
/>

<Video 
  prompt={{ text: "ocean waves", images: [img] }}
  model={fal.videoModel("wan-2.5")}
  seed={12345}
/>

// AI SDK
const { video } = await generateVideo({
  model: fal.videoModel("ltx-2-19b-distilled"),
  prompt: "cyberpunk city",
  seed: 42,
});

Files Changed

• src/react/types.ts - Add seed to ImageProps, VideoProps, MusicProps
• src/react/renderers/image.ts - Pass seed to generateImage
• src/react/renderers/video.ts - Pass seed to generateVideo
• src/react/renderers/music.ts - Pass seed to generateMusic
• src/ai-sdk/music-model.ts - Add seed to MusicModelV3CallOptions
• src/ai-sdk/generate-music.ts - Pass seed through to model
• src/ai-sdk/providers/fal.ts - Extend video seed support to WAN models
• src/ai-sdk/providers/higgsfield.ts - Add seed support for Soul images
• src/ai-sdk/providers/elevenlabs.ts - Add warning for unsupported seed

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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/support-imagen-seed-for-all-providers

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