refactor(portals): split the Stalker collection detail component

StalkerCollectionDetailComponent was 529 non-blank lines, well over the
400-line production maximum, and passed lint only because it sat in
tools/eslint/max-lines-baseline.mjs — a list CLAUDE.md says must only
shrink.

Extract four cohesive units into siblings in the same folder:

- stalker-collection-playback.controller.ts — playback ownership, inline
  playback and the external-player fallback
- stalker-collection-detail-mode.ts — pure item / detail-mode / category
  resolution (movie vs regular series vs embedded VOD series vs lazy
  is_series)
- stalker-collection-favorites.controller.ts — favorites resource, sync
  and toggle
- stalker-collection-store-snapshot.ts — store snapshot capture/restore

Both controllers follow the existing StalkerVodPlaybackController model —
plain classes taking a config object, constructed in a component field
initializer — rather than DI services. The playback controller needs the
component's `item` input signal and the favorites controller's rxResource
needs an injection context; a field initializer supplies both for free,
where a DI service would have needed an extra effect to feed the input
across.

Public template bindings and the component's public API are unchanged:
the signals are re-exported by reference, so neither the template nor the
spec sees the split. The spec is untouched and its 11 tests, plus the
rest of the project suite (272), pass exactly as before.

Regenerate the max-lines baseline so the file drops off it, and update
the three doc references that named resolveDetailMode() and
resolveSelectedCategory() as methods on the component.

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

tools/eslint/max-lines-baseline.mjs

@@ -41,7 +41,6 @@ export const maxLinesBaseline = [
     'libs/portal/stalker/data-access/src/lib/stores/features/with-stalker-content.feature.ts',
     'libs/portal/stalker/data-access/src/lib/stores/features/with-stalker-epg.feature.ts',
     'libs/portal/stalker/data-access/src/lib/stores/features/with-stalker-player.feature.ts',
-    'libs/portal/stalker/feature/src/lib/stalker-collection-detail.component.ts',
     'libs/portal/stalker/feature/src/lib/stalker-live-stream-layout/stalker-live-stream-layout.component.ts',
     'libs/portal/stalker/feature/src/lib/stalker-search/stalker-search.component.ts',
     'libs/portal/stalker/feature/src/lib/stalker-series-view/stalker-series-view.component.ts',