Function aur_install_helper_flags 

pub const fn aur_install_helper_flags(reinstall: bool) -> &'static str

What: Flag sequence for a non-interactive paru/yay -S install of AUR-only targets.

Inputs:

• reinstall: When true, omit --needed (reinstall path).

Output:

• Static flag string including -S and --aur (e.g. -S --aur --needed --noconfirm).

Details:

• Same string is passed to both helpers via aur_install_body.
• --aur ensures helpers do not prefer a sync database (e.g. Chaotic-AUR) when the same name exists on the AUR.