Function ensure_profile 

pub async fn ensure_profile(
    app: &App,
    tn_id: TnId,
    id_tag: &str,
) -> ClResult<bool>

Ensure a profile exists locally by fetching from remote if needed.

This function:

1. Checks if the profile already exists locally
2. If not, fetches the profile from the remote instance
3. Creates the profile locally with the fetched data

Returns Ok(true) if the profile was synced (created), Ok(false) if it already existed.