feat(portals): mark a whole series as watched in one click (#1451)

* feat(portals): mark a whole series as watched in one click

Adds a series-level watched toggle to the season header's new overflow
menu on both Xtream and Stalker series detail pages (issue #1442 v2,
building on the season-level toggle from #1447).

- Shared: buildSeriesWatchToggleRequest flattens every loaded season
  with the season builder's mark/unmark semantics; the direction is
  always the one the label advertised, never re-inferred at persist
  time. Watch-toggle state math for both scopes moves into the new
  component-provided SeasonWatchPresenter (the container component sat
  at the max-lines cap).
- Xtream: the series request reuses SerialDetailsSeasonWatchService
  through a scope-parameterized handle(), the same stillCurrent
  ownership guard, and the XtreamStore.loadAllPositions badge refresh.
- Stalker: the season handler's core is extracted into
  runWatchToggleBatch (feedback keys per scope). Lazy Ministra VOD
  hydrates unloaded seasons sequentially first (zero writes on a failed
  fetch, silent abort on navigation), re-runs the position reconcile
  synchronously so newly hydrated episodes' legacy rows are cleaned,
  then rebuilds the request keeping the clicked direction; an
  all-watched outcome reports an honest count-0 snackbar.
- Container: new hasUnloadedSeasons input blocks the fully-watched
  verdict and the count label while lazy seasons are unloaded, and the
  empty mark request contract lets the host hydrate-then-rebuild.

Six new XTREAM i18n keys, synced to all 18 locales via the i18n-fill
workflow. No new IPC: the existing playback-position batch channels are
season-agnostic.

Refs #1442

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

* fix(portals): treat an empty Stalker season answer as loaded, not pending

A lazy season the portal ANSWERS for with zero episodes was still
counted as unloaded (episodes.length === 0 heuristic): the series label
stayed countless forever and every series toggle re-fetched the empty
season, while a glitch-empty answer could silently skip a season and
still report success as if nothing remained.

VodSeriesSeasonVm gains an episodesLoaded flag set by every successful
episode fetch — including an empty one — and the series toggle's
pending predicate, hydration re-check, and hasUnloadedVodSeasons now
key on it. A loaded-and-empty season unblocks the count label and the
fully-watched verdict instead of re-fetching; a fresh detail mount
still re-fetches, so a one-off glitch self-corrects next session.

Addresses the Greptile P1 on PR #1451.

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

* fix(portals): harden lazy season hydration against malformed and racing loads

Two review findings on the series watched toggle:

- fetchVodSeriesEpisodes now trusts an empty answer only when the
  envelope actually carried a well-formed array; a malformed envelope or
  an answer whose rows contain no recognizable episode rejects, so the
  load fails instead of the season being recorded loaded-and-empty and
  silently skipped by the series batch.
- loadEpisodesForSeason is single-flight per season: a tab click, the
  spillover prefetch, the quick-start recursion, and the series-toggle
  hydration join one in-flight request instead of duplicating portal
  traffic — previously a second request's failure could abort a series
  toggle whose original request succeeded.

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

---------

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

docs/architecture/embedded-inline-playback.md

@@ -280,8 +280,45 @@ same captured playlist/series identity. After any Xtream toggle
 (single or batch) the host refreshes `XtreamStore.loadAllPositions` —
 the catalog reads series-progress badges from the store, which otherwise
 loads positions once per playlist — unless the playlist changed
-meanwhile. The
-host reports busy-state back through the `seasonWatchBatchRunning` input.
+meanwhile. The host reports busy-state back through the
+`seasonWatchBatchRunning` input.
+
+A series-level counterpart lives in a `⋮` menu at the end of the same
+header row (`SeasonWatchPresenter` in `libs/ui/components` owns the state
+math for both scopes; the container component sits at the max-lines cap).
+`buildSeriesWatchToggleRequest` flattens every LOADED season with the same
+mark/unmark semantics, and the direction is always the one the label
+advertised (`markWatched: !seriesFullyWatched()`), never re-inferred from
+data at persist time. Hosts route the request through the same machinery
+as the season toggle — Xtream via the scope-parameterized
+`SerialDetailsSeasonWatchService.handle(..., scope)`, Stalker via the
+extracted `runWatchToggleBatch` core — sharing the busy flag, the
+ownership guards, and the catalog-badge refresh. Stalker lazy-VOD is the
+special case: unopened seasons have empty episode lists, so the container
+reports them through the `hasUnloadedSeasons` input (blocks the
+"fully watched" verdict and switches the label to its countless variant),
+and may emit an EMPTY mark request when every loaded episode is watched.
+The Stalker host then hydrates the missing seasons sequentially through
+`loadEpisodesForSeason` (aborting silently on navigation, and aborting
+with zero writes plus the series failure snackbar if any season fails to
+load). A season the portal ANSWERS for with zero episodes becomes
+loaded-and-empty (`VodSeriesSeasonVm.episodesLoaded`), not pending —
+`episodes.length === 0` alone would keep it counted as unloaded forever,
+locking the label countless and re-fetching it on every series toggle.
+Only a well-formed empty array earns that trust: `fetchVodSeriesEpisodes`
+rejects a malformed envelope or an answer whose rows contain no
+recognizable episode, so those fail the load instead of masquerading as
+an empty season. `loadEpisodesForSeason` is single-flight per season — a
+tab click, the spillover prefetch, the quick-start recursion, and the
+series-toggle hydration join one in-flight request instead of
+duplicating it (a second request's failure could abort a toggle whose
+original request succeeded).
+The host synchronously re-runs the position reconcile
+(`applyReconciledSeriesPositions` — the effect-fed maps only update on
+the next change-detection tick, and enqueuing against stale maps would
+miss the hydrated episodes' legacy rows), rebuilds the request from the
+now-complete seasons keeping the captured direction, and reports an
+honest count-0 success if hydration reveals nothing left to mark.
 
 ## Components