maintainer edit: render the Projects divider only before the first project group so Chats can sort between projects without duplicating the heading. Add middle and last ordering regression coverage.
In project-based sidebar grouping, the "Chats" section (non-project
conversations) was always appended at the end regardless of its most
recent updated_at. This meant the newest conversation could appear
below older project groups.
Move Chats group insertion before the global sort, compute its
updatedAt from its most recently updated session, and sort all groups
together by updatedAt descending.
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