Function getAttachmentDataUrl

src/renderer/src/hooks/useAttachment.ts:221–227

(attachment: FileAttachment)

// 读取附件为 data URL（用于预览）
export async function getAttachmentDataUrl(attachment: FileAttachment): Promise<string> {
  const result = await window.api.attachment.read(attachment.localPath)
  if (result.success && result.content) {
    return `data:${attachment.type};base64,${result.content}`
  }
  throw new Error(result.error || 'Failed to read attachment')
}

// 独立的文件选择并保存函数（用于消息编辑等场景）
export async function selectAndSaveAttachments(): Promise<FileAttachment[]> {