vercel/ai @ai-sdk/xai@4.0.0-beta.46 on GitHub

78b6433: feat(provider/xai): support non-image file parts (PDF, text, CSV) in the Responses API via input_file + file_url
The xAI Responses API accepts { type: 'input_file', file_url } for non-image documents (see https://docs.x.ai/docs/guides/chat-with-files), but the AI SDK xAI Responses provider previously threw UnsupportedFunctionalityError for any file part whose mediaType did not start with image/.
When a file part is passed with data: URL and a non-image media type, the provider now emits { type: 'input_file', file_url }. application/pdf and text/* are also added to supportedUrls so the SDK does not download them to bytes before reaching the converter.
Inline-byte (base64) inputs for non-image media types continue to throw, since xAI's Responses API requires either a public URL or a pre-uploaded file_id for non-image documents.