Scoped selector for the bar rects of one dataset group (multi-dataset
charts). Frappe renders each dataset in its own .dataset-{index} group,
so scoping to that group keeps the SVG element count aligned with the
converted dataset's data points (otherwise a multi-dataset chart matches
every group's rects and highlighting is dropped on the count mismatch).
Scoped selector for the bar rects of one dataset group (multi-dataset charts). Frappe renders each dataset in its own
.dataset-{index}group, so scoping to that group keeps the SVG element count aligned with the converted dataset's data points (otherwise a multi-dataset chart matches every group's rects and highlighting is dropped on the count mismatch).