CI / build + unit + e2e (pull_request) Successful in 2m47s
The TabsList is now position:sticky top:0 with a z-index above the panel content. In wide mode it pins to the top of the OPERATIONS scroll area (#21's center-pane scroller); in narrow mode, where the body scrolls and there is no inner scroll container, it pins to the viewport. The existing opaque background keeps scrolled content from showing through.