Swap the positions of the 'Private %' and 'Commits %' columns in the DevIndex grid.

Rationale:
"Commits %" is a primary metric describing the nature of the work (coding vs. other), making it a closer sibling to "Total Contributions". "Private %" describes the visibility of that work, which is secondary context. Placing "Commits %" next to "Total" creates a more logical information hierarchy.

Task:

1. Update apps/devindex/view/home/GridContainer.mjs to reorder the columns in buildDynamicColumns.