pub fn render_scrollbar(
frame: &mut Frame<'_>,
area: Rect,
scroll_offset: usize,
visible_rows: usize,
total_rows: usize,
)Expand description
Render the right-edge scrollbar over area if the list overflows.
Silently no-ops when every row already fits — that’s the common
case (most operators have <8 batches / <30 peers / <5 tags).