git_graph: Fix commit message overflowing into changed files section (#61177)

This regressed in https://github.com/zed-industries/zed/pull/59674

Closes FR-125

Release Notes:

- Fixed an issue where the commit message in the git panel could overlap
other content
6d66d5749dLukas Wirth committed on 7/17/2026, 8:57:46 AM· committed by GitHubparentc7148c8
1 file changedLine totals unavailable