Desktop: archived sessions are hard to discover — no visible "Archived" filter or section

Archived sessions in the desktop app (Windows) can only be found by typing their title into the sidebar search — there is no visible "Archived" section in the sidebar and no filter near the search box. If you don't already know a session's title, there is no way to browse archived chats.

Suggestion: add an "Archived" section or a show-archived toggle to the session sidebar. (The docs mention an "Archived list" but don't document where it is.)