This task updates the DevIndex.view.home.StatusToolbar to include a new "Total Contributions" label.

Changes:

1. Rename updateRowsLabel to updateRowsLabels: Reflecting the fact that it now manages multiple labels.
2. Add Total Contributions Label: A new label displaying the summed contributions.
3. Turbo Mode Support: The summation logic handles both Neo.data.Record instances (via totalContributions field) and raw data objects (via tc property) to support the store's lazy instantiation mode.
4. Separator: Added a bullet • separator between the Total Contributions and Visible Rows labels.
5. Positioning: Placed Total Contributions before Visible Rows for better visual hierarchy.

This enhancement provides researchers and users with immediate aggregate data on the currently filtered view.