$FunctionCode = @'
function ssh-copy-id {
    param([Parameter(Mandatory=$true)][string]$RemoteTarget)
    $KeyPath = "$env:USERPROFILE\.ssh\id_ed25519.pub"
    if (!(Test-Path $KeyPath)) {
        Write-Error "Public key not found at $KeyPath"
        return
    }
    $PubKey = Get-Content $KeyPath
    ssh $RemoteTarget "mkdir -p ~/.ssh && chmod 700 ~/.ssh && echo '$PubKey' >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"
}
'@

Add-Content -Path $PROFILE -Value $FunctionCode

. $PROFILE