Compatibilidad de adjuntos de imagen en el SDK de Claude Agent

1. Replace the current send message component with {参考代码文件1} 2. Refer to the async send(prompt: string, attachments?: AttachmentData[], includeSelection?: boolean) in {参考代码文件2} and the export const composeUserContent = (text: string, attachments?: AttachmentData[], selection?: SelectionSnapshot | null) in {参考代码文件3} to implement attachment handling 3. After clicking send, convert attachments to base64 strings and send them to the websocket 4. Refer to the code below, rewrite the message handling part of ccsdk/ai-client.ts to support sending attachments {官方文档示例代码docs.claude.com/en/api/agent-sdk/streaming-vs-single-mode} Please think carefully and then execute