Import the retail arrow-only spell bar scrollbar from LayoutDesc, preserve authored end-button extents and HideDisabled behavior in the shared retained widget, and bind each favorite list to its sole horizontal pixel-scroll model. Match retail selection exposure for off-screen spells and pin the behavior with real-fixture conformance tests.
Document the six-slice world-interaction completion program as the active pre-M4 work order.
Co-authored-by: Codex <codex@openai.com>
