fix(portals): a failed episode launch is reported on its own series only

The series page is reused across titles; a launch that fails after the
viewer moved on is logged but not shown over the new series.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

libs/portal/xtream/feature/src/lib/serial-details/serial-details-menu.service.ts

@@ -242,6 +242,8 @@ export class SerialDetailsMenuService {
         if (!bindings || !episode) {
             return;
         }
+        const seriesId = this.seriesId();
+        const playlistId = this.xtreamStore.currentPlaylist()?.id;
         try {
             await bindings.openEpisodeExternally(
                 episode,
@@ -249,7 +251,14 @@ export class SerialDetailsMenuService {
             );
         } catch (error) {
             this.logger.warn('External episode launch failed', error);
-            this.notify('PORTALS.PLAYBACK_ERROR');
+            // The page is reused across series: a failure that lands after
+            // the viewer moved on is not the new title's problem.
+            if (
+                this.seriesId() === seriesId &&
+                this.xtreamStore.currentPlaylist()?.id === playlistId
+            ) {
+                this.notify('PORTALS.PLAYBACK_ERROR');
+            }
         }
     }