* fix: hide archived section and empty folders when no sessions remain
- Only push archived group in useSessionGrouping when there are archived
sessions, preventing an empty archived section from rendering
- Hide empty folders in archived bucket via shouldKeepFolder check in
SessionGroupSection (folders with no sessions and no content in
children are filtered out)
- Always filter folders through shouldKeepFolder, not just during search
* perf: memoize archived folder filtering
jwcrystal
5ea2fed0d3