Andy Dixon
f09300fd95
Every shared lock was std::sync::Mutex with lock().unwrap() (~150 sites), so a panic in any session's reader or callback poisoned the lock and the next UI frame panicked too, dropping every open session. Locks are now parking_lot::Mutex (no poisoning; already in the dependency tree), and a panic hook reports worker panics as an error toast instead of the session silently stopping (F3, F4).