Sidebar renders under toolbar when a second repository tab is opened (macOS Tahoe) #2722

Fork 2.70.2, macOS Tahoe 26.6.2, MacBook Pro 14" (M4).

Steps to reproduce:

1. Launch Fork with one repository open in full screen. The sidebar displays correctly.
2. Open a second repository so it appears as a tab.
3. The top of the left sidebar (repository header and “Local Changes”) is now hidden under the toolbar/tab bar and can’t be scrolled into view.

The issue persists in full screen. Restarting Fork fixes it until a second repo is opened again. Looks like the sidebar’s top inset isn’t updated when the tab bar changes. Screenshots attached (one repo vs. two repos).