fix(portals): a failed episode launch is reported to its own visit only

The menu compares the playback service's series+visit page token, so a
launch started on an earlier visit of the same series does not surface
its failure after the viewer came back.

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

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

@@ -40,6 +40,8 @@ interface SerialDetailsMenuBindings {
     /** A forced launch has not published its session yet: bulk watched actions would include it. */
     readonly startPending: Signal<boolean>;
     readonly resetProgress: () => Promise<void>;
+    /** Series and visit on screen; a launch's failure is reported to that page only. */
+    readonly pageToken: () => string;
     /** The regular episode start forced to MPV/VLC, so history and the launch position are recorded. */
     readonly openEpisodeExternally: (
         episode: XtreamSerieEpisode,
@@ -242,8 +244,7 @@ export class SerialDetailsMenuService {
         if (!bindings || !episode) {
             return;
         }
-        const seriesId = this.seriesId();
-        const playlistId = this.xtreamStore.currentPlaylist()?.id;
+        const token = bindings.pageToken();
         try {
             await bindings.openEpisodeExternally(
                 episode,
@@ -251,12 +252,10 @@ export class SerialDetailsMenuService {
             );
         } catch (error) {
             this.logger.warn('External episode launch failed', 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
-            ) {
+            // The page is reused across series and visits: a failure that
+            // lands after the viewer moved on (or came back) is not the
+            // current visit's problem.
+            if (bindings.pageToken() === token) {
                 this.notify('PORTALS.PLAYBACK_ERROR');
             }
         }

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

@@ -413,7 +413,7 @@ export class SerialDetailsPlaybackService {
      * only while the page still shows what it showed when the launch
      * started, not after leaving and coming back.
      */
-    private pageToken(): string {
+    pageToken(): string {
         return `${this.launchOwner()}#${this.pageGeneration}`;
     }
 

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

@@ -229,6 +229,7 @@ export class SerialDetailsComponent implements OnDestroy {
                     this.playback.activeEpisodeId() !== null
             ),
             startPending: this.playback.forcedLaunchPending,
+            pageToken: () => this.playback.pageToken(),
             resetProgress: () => this.resetProgress(),
             openEpisodeExternally: (episode, player) =>
                 this.playback.playEpisode(episode, player),