/** Copie texte — writeText async + repli synchrone execCommand. */
export async function copyTextToClipboard(text: string): Promise<boolean> {
  if (typeof window === 'undefined') return false

  if (navigator.clipboard?.writeText) {
    try {
      await navigator.clipboard.writeText(text)
      return true
    } catch {
      // repli ci-dessous
    }
  }

  try {
    const ta = document.createElement('textarea')
    ta.value = text
    ta.setAttribute('readonly', '')
    ta.style.position = 'fixed'
    ta.style.left = '-9999px'
    ta.style.top = '0'
    document.body.appendChild(ta)
    ta.focus()
    ta.select()
    const ok = document.execCommand('copy')
    document.body.removeChild(ta)
    return ok
  } catch {
    return false
  }
}