fix(GWC-35): repair re-raised alarm snapshots

src/ZB.MOM.WW.MxGateway.Server/Alarms/GatewayAlarmMonitor.cs

@@ -839,15 +839,17 @@ public sealed class GatewayAlarmMonitor : BackgroundService, IGatewayAlarmServic
                         new AlarmFeedMessage { Transition = TransitionFromSnapshot(incoming.Value, AlarmTransitionKind.Raise) },
                         incoming.Key);
                 }
-                else if (existing.CurrentState != incoming.Value.CurrentState
-                    && incoming.Value.CurrentState == AlarmConditionState.ActiveAcked)
+                else if (existing.CurrentState != incoming.Value.CurrentState)
                 {
-                    // The alarm was already known but the worker now reports it acknowledged: the
-                    // live Acknowledge transition never reached the feed. Without this the acked
-                    // state is absorbed silently by the snapshot replace below and subscribers show
-                    // the alarm unacked until it clears.
+                    // The alarm was already known but the worker now reports a different state. An
+                    // ActiveAcked snapshot repairs a missed Acknowledge. Any other incoming active
+                    // state repairs a missed Raise for the incoming instance (including an
+                    // acknowledged alarm reference that was cleared and re-raised between passes).
+                    AlarmTransitionKind kind = incoming.Value.CurrentState == AlarmConditionState.ActiveAcked
+                        ? AlarmTransitionKind.Acknowledge
+                        : AlarmTransitionKind.Raise;
                     Broadcast(
-                        new AlarmFeedMessage { Transition = TransitionFromSnapshot(incoming.Value, AlarmTransitionKind.Acknowledge) },
+                        new AlarmFeedMessage { Transition = TransitionFromSnapshot(incoming.Value, kind) },
                         incoming.Key);
                 }
             }