Fix sidebar orchestration rows when live agent entries lack direct worktree IDs

Current sidebar live-entry attribution misses the parent-pane worktree fallback, so running workers can disappear from per-project counts. Reimplement the focused fallback and full-rebuild guard on current main. Source PR: https://github.com/stablyai/orca/pull/17019. Contributor credit: @eladkishon. Owner scope: renderer/sidebar only; no contributor action requested.