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>

docs/architecture/m3u-playlist-module.md

@@ -363,7 +363,8 @@ activation, and the details dialog behave identically to the timeline.
   no-EPG-anywhere states and while loading. Return-to-live is a playback control
   (`!isLivePlayback()`) and is independent of EPG state.
 - **State-driven affordances.** Blocks are coloured past / now / future, with a
-  red "now" playhead. Catch-up "Watch" appears on past blocks only when
+  red "now" playhead. Catch-up "Watch" appears on past blocks — and as a
+  start-over replay button on the currently-airing block — only when
   `archivePlaybackAvailable` (Xtream `tv_archive`, M3U `catchup-*`); Stalker is
   schedule-only (dimmed past + a notice, no false buttons). The "i" button opens
   the shared `app-epg-item-description` dialog with a state-aware action.

docs/architecture/xtream-portal-compatibility.md

@@ -111,3 +111,12 @@ playable. MPEG-TS is preferred before HLS when the provider allows it because
 some portals return a valid HLS manifest while the first media segment fails in
 Chromium/video.js. PWA fallback keeps the REST MPEG-TS URL when no Electron
 probe API is available.
+
+Catch-up is offered from the Xtream Live TV tab and from the unified
+collection surfaces (per-playlist and global Favorites and Recent). The
+`tv_archive` / `tv_archive_duration` columns are carried through the
+favorites and recently-viewed DB projections and mapped onto
+`UnifiedCollectionItem.tvArchive` / `tvArchiveDuration` so the shared live
+tab can gate the timeline's archive window. `tv_archive_duration` is
+interpreted as **days** everywhere, matching
+`live-stream-layout.controlledArchiveDays` (issue #1138).