This PR adds the diff stat numbers to the `git: branch diff` view toolbar. <img width="550" height="1964" alt="Screenshot 2026-02-20 at 10 58@2x" src="https://github.com/user-attachments/assets/0fc63b64-ce6e-417a-92b5-8008f2561a8f" /> --- Before you mark this PR as ready for review, make sure that you have: - [x] Added a solid test coverage and/or screenshots from doing manual testing - [x] Done a self-review taking into account security and performance aspects - [x] Aligned any UI changes with the [UI checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) Release Notes: - Git: Added diff stat numbers to the Branch Diff (`git: branch diff`) view.