feat(xtream): add catch-up playback to favorites and recent tabs (#1166)

Enables Xtream catch-up/timeshift from the Favorites and Recent surfaces (per-playlist and global), not just Live TV, and adds start-over replay of the currently-airing programme. Carries tv_archive/tv_archive_duration through the favorites and recently-viewed DB projections and maps them onto UnifiedCollectionItem; tv_archive_duration is interpreted as days, matching live-stream-layout.controlledArchiveDays.

Closes #1138.

Co-authored-by: Claude <noreply@anthropic.com>

libs/shared/interfaces/src/lib/playlist.interface.ts

@@ -54,6 +54,8 @@ export interface Playlist {
     recentlyViewed?: PlaylistRecentlyViewedItem[];
     /** Indicates if this is a full stalker portal URL (e.g., /stalker_portal/c) requiring handshake authentication */
     isFullStalkerPortal?: boolean;
+    /** Xtream server timezone string for catch-up URL construction */
+    serverTimezone?: string;
     /** Session token for full stalker portal authentication - persisted for session */
     stalkerToken?: string;
     /** Serial number for stalker portal - generated once and stored for consistency */