Two issues are going on here: When collapsing a tab group that contains a split view and no other tabs, the split view is still shown rather than hidden as expected and the overflow count reads "+0". We shouldn't be displaying any overflow count that's less than 1. Another issue I've seen with tab groups that contain nothing but a split view is that there's supposed to be a transition when collapsing/expanding the tab group that doesn't seem to be applying to the split view. [Specs](https://www.figma.com/design/URUNfOzQNRFiQnz67coSd0/Sidebar-Enhancements-Specs?node-id=8878-14903&t=5inxb0TBINtC1hKf-1) [Tech Spec Doc](https://docs.google.com/document/d/1KRPZweENekHvtGsDJOQ205tVM95wftcYfhvzvjG2wPA/edit?tab=t.48t3yma3hfh3#heading=h.uzlu64o5i8z3)
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Two issues are going on here: When collapsing a tab group that contains a split view and no other tabs, the split view is still shown rather than hidden as expected and the overflow count reads "+0". We shouldn't be displaying any overflow count that's less than 1. Another issue I've seen with tab groups that contain nothing but a split view is that there's supposed to be a transition when collapsing/expanding the tab group that doesn't seem to be applying to the split view. Note there's already another bug on file for collapsing a tab group not hiding the split view when it doesn't contain an active tab (bug 1995257). [Specs](https://www.figma.com/design/URUNfOzQNRFiQnz67coSd0/Sidebar-Enhancements-Specs?node-id=8878-14903&t=5inxb0TBINtC1hKf-1) [Tech Spec Doc](https://docs.google.com/document/d/1KRPZweENekHvtGsDJOQ205tVM95wftcYfhvzvjG2wPA/edit?tab=t.48t3yma3hfh3#heading=h.uzlu64o5i8z3)