Function char_to_byte

src/apps/cli/src/ui/model_config_form.rs:1120–1125

(s: &str, char_idx: usize)

// ── Helpers ──

fn char_to_byte(s: &str, char_idx: usize) -> usize {
    s.char_indices()
        .nth(char_idx)
        .map(|(i, _)| i)
        .unwrap_or(s.len())
}