fix(epg): wire catch-up Watch button in unified live tab, surface resolve failures (#1133)

* fix(epg): wire catch-up Watch button in unified live tab, surface resolve failures

The favorites/recent live views (UnifiedLiveTabComponent) passed
archivePlaybackAvailable/archiveDays to the EPG timeline and list view, so
the "Watch" button and the dialog's "Watch from start" action rendered —
but neither (programActivated) nor (returnToLive) was bound. Clicking
Watch emitted an event nobody listened to: no error, no feedback, no
playback change.

- Handle programActivated in the unified live tab: resolve the catch-up
  URL via resolveM3uCatchupUrl, swap the inline player's playback target
  (or hand it to the configured external player), show the
  "Archive playback" summary label, "From archive" block tag and
  "Return to live"; clear the override on channel switch/close/return.
- Never fail silently: both the unified tab and the m3u-state effect now
  show an EPG.TIMELINE.CATCHUP_FAILED snackbar when the replay URL can't
  be resolved. New i18n key translated into all 17 locales via the
  i18n-fill workflow.
- Extract the effect's resolve branch into a pure
  resolveActiveEpgProgramAction util and the unified tab's EPG summary
  helpers into unified-live-epg-summary.util.ts (component shrinks
  598 → 572 lines despite the new feature).
- Regression coverage: 6 component tests for the catch-up flow,
  3 unit tests for the resolver action; docs updated in
  m3u-playlist-module.md.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(epg): address PR review — untrack progress tick in archive summary, open live external without prior timeshift

- liveEpgPanelSummary no longer tracks the 30s progressTick while an
  archived programme is shown (Greptile P2): the archive summary is
  frozen, so re-running the computed each tick only produced needless
  re-renders.
- returnToLivePlayback no longer early-returns when no timeshift is
  active (Codex P2): with an external player configured and
  openStreamOnDoubleClick enabled, the programme dialog's "Watch live"
  action now launches the external player instead of being dropped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

docs/architecture/m3u-playlist-module.md

@@ -652,6 +652,16 @@ class EpgService {
   `playlistState.activePlaybackUrl`. Inline and external players use
   `activePlaybackUrl ?? activeChannel.url`, and returning to live playback
   clears the override.
+- The unified favorites/recent live tab
+  (`libs/portal/shared/ui/.../unified-collection/unified-live-tab.component.ts`)
+  hosts the same timeline but does not use the NgRx playlist state; it keeps
+  its own `activeTimeshift` signal, resolves the replay URL with
+  `resolveM3uCatchupUrl`, and swaps the inline player's playback target (or
+  hands the URL to the configured external player). Selecting another channel,
+  closing the player, or "Return to live" clears the override.
+- Catch-up activation is never silent: if the replay URL cannot be resolved
+  for a programme the user clicked, both hosts surface a
+  `EPG.TIMELINE.CATCHUP_FAILED` snackbar instead of doing nothing.
 
 ## Interfaces