test(portals): pin that a blocked refresh stops before the guard reset

The serialization test proved the second run was refused, but only through a
`sendIpcEvent` call count — the ordering was implied rather than stated. Assert
the recorded sequence directly instead: the refused call must add nothing at
all, leaving exactly one guard reset and one delete.

The distinction matters because the reset is what re-opens a host after the
failures that led here. A check placed after it would let a run that is not
allowed to proceed clear that evidence on the way out. Moving the in-flight
check (and its insertion) below the reset now fails this test.

Raised by Greptile on #1431.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

libs/playlist/shared/ui/src/lib/xtream-refresh-flow.service.spec.ts

@@ -199,11 +199,19 @@ describe('XtreamRefreshFlowService', () => {
 
         // The row's reporter honestly reports "not busy": it tracks its own id
         // set and never saw the header action start. Only the flow can refuse
-        // this, and it must refuse before the guard reset — a second run would
-        // park an already-emptied catalog over the first run's snapshot.
+        // this, and it would park an already-emptied catalog over the first
+        // run's snapshot.
+        const observedBeforeSecondConfirm = [...order];
         service.confirmAndRefresh(item, sourcesRow.reporter);
         await Promise.resolve();
 
+        // Rejected before the connectivity-guard reset, not merely before the
+        // delete: the reset is what re-opens the host after the failures that
+        // led here, so a second one inside the first run's window would clear
+        // evidence on behalf of a run that is not allowed to proceed. The
+        // refused call must therefore add nothing at all.
+        expect(order).toEqual(observedBeforeSecondConfirm);
+        expect(order).toEqual([`ipc:${CONNECTIVITY_GUARD_RESET}`, 'delete']);
         expect(sourcesRow.calls).toEqual([]);
         expect(
             databaseService.deleteXtreamPlaylistContent