Desktop: archived sessions are hard to rediscover — filter is an unlabeled icon, Settings search finds nothing

Archiving a session is one click, but reopening one is hard to discover.

• The archived-session filter is an unlabeled sliders icon on the "Recents" header in the sidebar.
• Searching "sessions" or "archive" in Settings returns nothing relevant.
• The docs describe filter controls "at the top of the sidebar", which doesn't match the current layout.

A user who archives the wrong chat has no obvious recovery path (this happened to me today — it took a support session to find the filter icon).

Suggestions:

• Label the filter, or add an explicit "Archived" section to the sidebar.
• Make Settings search surface the archived-sessions filter.
• Show an "Undo" toast after archiving.

Environment: Claude Code desktop app on Windows 11.