Function build_repositories_modal_fields_default 

pub fn build_repositories_modal_fields_default() -> (Vec<RepositoryModalRow>, Option<String>, Vec<String>)

What: Convenience wrapper using resolved Pacsea paths and system pacman.conf.

Inputs:

• None (reads resolve_repos_config_path and /etc/pacman.conf).

Output:

• Same tuple as build_repositories_modal_fields.

Details:

• Call from UI handlers when opening the modal.