fix: hide ????????? after session terminate (0.3.8)

Persist session_terminated in event details, expose in API, and update Events/Dashboard UI.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/utils/sessionActions.ts

@@ -14,3 +14,19 @@ export function eventSupportsSessionTerminate(event: Pick<EventSummary, "type">)
     WINDOWS_SESSION_EVENT_TYPES.has(event.type)
   );
 }
+
+export function showEventSessionTerminateButton(
+  event: Pick<EventSummary, "type" | "session_terminated">,
+): boolean {
+  return eventSupportsSessionTerminate(event) && !event.session_terminated;
+}
+
+export function markEventSessionTerminatedInList(
+  items: EventSummary[] | undefined,
+  eventId: number,
+): void {
+  const item = items?.find((row) => row.id === eventId);
+  if (item) {
+    item.session_terminated = true;
+  }
+}