Function draw_picker_split 

pub fn draw_picker_split(
    f: &mut Frame<'_>,
    app: &AppState,
    items: &[&str],
    _descs: &[&str],
    state: &mut ListState,
    selected_info: Option<&str>,
    meta_lines: &[Line<'_>],
)

Draw the file picker with a horizontal split: pip-style file list on the left, live metadata preview on the right. Used by the .bak recover flow.