restoreMuxSessions() re-applied name, auto-clear, auto-compact, auto-resume, nice and the
flicker filter from state.json but not color, pinned/pinnedAt or imageWatcherEnabled, which
the reboot-restore path (reapplyPersistedSessionState) already restores. After a restart or
crash a surviving pane came back uncoloured, unpinned and with its image watcher off, and the
next persist wrote that over the saved values. Found by killing -9 a server with a coloured,
pinned shell session and restarting it.
