Allow hiding git diff line count indicators (+N -N) in sidebar

Feature Request

The recent Claude Code update introduced git diff line count indicators (+N -N) next to conversation names in the sidebar.

Problem: There is no way to disable or hide these indicators. For users who find them distracting or visually unappealing, there should be an opt-out option.

Request: Please add a setting (e.g., in settings.json or UI preferences) to hide/show the git diff statistics in the sidebar. Something like:

{
  "showDiffStats": false
}

This was not present before the recent update and some users would prefer the cleaner look without these numbers.

Thank you!