Function offer_save_api_token 

pub fn offer_save_api_token(token: &str) -> Result<bool>

Propose saving the status-api bearer to ~/.config/horto-os-ui/api_token.

TTY: [y/N] prompt. Non-TTY: skip write and log the hex once for paste.

Errors

Returns crate::HortoError when stdin cannot be read or the file write fails.