feat: show RDP session duration in Overview and Events (0.5.16)

Add session_duration_sec to EventSummary and a Duration column (HH:MM:SS / Nd HH:MM:SS).

frontend/src/views/DashboardView.vue

@@ -238,6 +238,8 @@
 
           <th>Пользователь</th>
 
+          <th title="Длительность сессии (из session_duration_sec)">Длительность</th>
+
           <th>Версия агента</th>
 
           <th>Severity</th>
@@ -276,6 +278,8 @@
 
           <td>{{ e.actor_user || "—" }}</td>
 
+          <td>{{ formatSessionDuration(e.session_duration_sec) }}</td>
+
           <td>{{ e.product_version || "—" }}</td>
 
           <td :class="'sev-' + e.severity">{{ e.severity }}</td>
@@ -354,6 +358,7 @@ import RdgQwinstaModal from "../components/RdgQwinstaModal.vue";
 import { useRdgQwinsta } from "../composables/useRdgQwinsta";
 import { formatServerName } from "../utils/hostDisplay";
 import { hasRdgFlapUi, rdgQwinstaEventId } from "../utils/rdgFlap";
+import { formatSessionDuration } from "../utils/sessionDuration";
 import { markEventSessionTerminatedInList, showEventSessionTerminateButton } from "../utils/sessionActions";
 
 const { qwinstaLoadingId, qwinstaModal, closeQwinstaModal, runQwinsta, runLogoff } = useRdgQwinsta();