fix(playback): clarify external player launch feedback (#1388)

libs/shared/interfaces/src/lib/external-player-session.interface.ts

@@ -3,11 +3,7 @@ import { PlayerContentInfo } from './portal-playback.interface';
 export type ExternalPlayerName = 'mpv' | 'vlc';
 
 export type ExternalPlayerSessionStatus =
-    | 'launching'
-    | 'opened'
-    | 'playing'
-    | 'error'
-    | 'closed';
+    'launching' | 'opened' | 'playing' | 'error' | 'closed';
 
 export interface ExternalPlayerSession {
     id: string;
@@ -21,4 +17,6 @@ export interface ExternalPlayerSession {
     updatedAt: string;
     error?: string;
     canClose: boolean;
+    /** Exact failed replacement displaced by this restored live session. */
+    restoredFromSessionId?: string;
 }