fix(xtream): try advertised TS after initial web HLS HTTP failure (#1558)

* fix(xtream): try advertised TS after initial web HLS HTTP failure

* refactor(playback): extract fullscreen channel panel state

* test(xtream): keep synthetic media within the mock project

libs/shared/interfaces/src/lib/portal-playback.interface.ts

@@ -10,6 +10,8 @@ export interface PlayerContentInfo extends Omit<
 
 export interface ResolvedPortalPlayback {
     streamUrl: string;
+    /** Source-owner supplied, advertised TS alternative for Xtream live Auto only. */
+    liveAutoTsUrl?: string;
     title: string;
     thumbnail?: string | null;
     isLive?: boolean;