Opus advisor found a key-space asymmetry: _pruneLineageReportCacheToVisibleSessions
built visibleKeys from RAW rows via _sidebarLineageKeyForRow, but the render loop
keys the lineage-report cache by _sidebarLineageKeyForRow on the COLLAPSED row,
which can differ when collapse merges segments. On a malformed/edge chain the
expanded row's cache could be evicted every payload and re-fetched ~every 5s
(partial regression of the bug #4020 fixes). Fold the collapsed rows' cache keys
into the visible set too, mirroring the _resolveSessionIdFromSidebarLineage
precedent, behind a defensive try/catch.
docs(changelog): stamp #4020+#4055 as v0.51.373 (Release ML)
nesquena-hermes