Function check_passwordless_sudo_available 

pub fn check_passwordless_sudo_available() -> Result<bool, String>

What: Check if passwordless privilege escalation is available for the current user.

Inputs:

• None (uses the active privilege tool from settings).

Output:

• Ok(true) if passwordless execution is available, Ok(false) if not, or Err(String) on error.

Errors

• Returns Err if the check cannot be executed (e.g., tool not installed).

Details:

• Delegates to crate::logic::privilege::PrivilegeTool::check_passwordless.
• Uses the resolved privilege tool (sudo or doas) based on settings.
• Both sudo and doas support -n true for non-interactive checking.