We need to add a "Commits Only" toggle to the DevRank controls. This involves several updates:

1. Data Model (Contributor.mjs):

   • Store a secondary array for commits (c mapping, commits field).
   • Update total_contributions and year fields (y2020, etc.) to be dynamic based on the active mode (Total vs. Commits).

2. UI (ControlsContainer.mjs):

   • Add a CheckBox for "Commits Only".
   • Implement a handler to switch the grid's data context.

3. Grid (GridContainer.mjs):

   • Ensure columns binding to yXXXX fields update correctly when the underlying data logic changes.
   • Trigger a re-sort if the active sort column is affected (e.g. total_contributions).

4. Backend (Updater.mjs):

   • Already updated to fetch totalCommitContributions. We need to ensure this data is now persisted in the users.json schema (as a separate array or structure).

This ticket focuses on the frontend implementation (1-3) and assumes data is available or will be mocked until the backend fully populates it.