perf(portal): make the portal Eager components OnPush

Plan item C6 step 3 for libs/portal: the nine Eager components in
portal/shared/ui, portal/stalker/feature and portal/xtream/feature switch
to OnPush. Their templates read signals, signal inputs, async pipes and
template-event state; the plain fields they write outside events
(playback request ids, save throttles) are not rendered.

The already-OnPush live channel lists filled their favorites Maps in a
subscription and the Xtream list dropped programme previews after the EPG
mapping dialog, all without marking the view. They now call markForCheck
like the neighbouring handlers do, so a late favorites answer shows its
hearts without waiting for an unrelated check. A regression test for the
Xtream list fails without the call.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/architecture/zoneless-migration.md

@@ -143,15 +143,15 @@ files that still contain `ChangeDetectionStrategy.Eager`.
 
 ### libs/portal (9)
 
-- [ ] `libs/portal/shared/ui/src/lib/components/favorites-layout/favorites-layout.component.ts`
-- [ ] `libs/portal/shared/ui/src/lib/components/playlist-error-view/playlist-error-view.component.ts`
-- [ ] `libs/portal/shared/ui/src/lib/components/search-form/search-form.component.ts`
-- [ ] `libs/portal/shared/ui/src/lib/navigation/portal-rail-links.component.ts`
-- [ ] `libs/portal/stalker/feature/src/lib/stalker-catalog-detail/stalker-catalog-detail.component.ts`
-- [ ] `libs/portal/stalker/feature/src/lib/stalker-favorites-button/stalker-favorites-button.component.ts`
-- [ ] `libs/portal/stalker/feature/src/lib/stalker-series-view/stalker-series-view.component.ts`
-- [ ] `libs/portal/xtream/feature/src/lib/global-search-results/global-search-results.component.ts`
-- [ ] `libs/portal/xtream/feature/src/lib/serial-details/serial-details.component.ts`
+- [x] `libs/portal/shared/ui/src/lib/components/favorites-layout/favorites-layout.component.ts`
+- [x] `libs/portal/shared/ui/src/lib/components/playlist-error-view/playlist-error-view.component.ts`
+- [x] `libs/portal/shared/ui/src/lib/components/search-form/search-form.component.ts`
+- [x] `libs/portal/shared/ui/src/lib/navigation/portal-rail-links.component.ts`
+- [x] `libs/portal/stalker/feature/src/lib/stalker-catalog-detail/stalker-catalog-detail.component.ts`
+- [x] `libs/portal/stalker/feature/src/lib/stalker-favorites-button/stalker-favorites-button.component.ts`
+- [x] `libs/portal/stalker/feature/src/lib/stalker-series-view/stalker-series-view.component.ts`
+- [x] `libs/portal/xtream/feature/src/lib/global-search-results/global-search-results.component.ts`
+- [x] `libs/portal/xtream/feature/src/lib/serial-details/serial-details.component.ts`
 
 Test stubs that set Eager (`*.spec.ts`, `*.spec-stubs.ts`, `*.spec-data.ts`,
 `*.test-helpers.ts`) are not listed; they do not ship.
@@ -170,9 +170,9 @@ the field a signal (or a `computed`), or writes it through one.
 | [ ] | `libs/playlist/shared/ui/src/lib/recent-playlists/playlist-item/playlist-item.component.ts` `checkPortalStatus` | plain `portalStatus` assigned after `await` in `ngOnInit` (PWA only: skipped when source health is supported) | playlist |
 | [ ] | `libs/playlist/shared/ui/src/lib/recent-playlists/playlist-info/playlist-info.component.ts` (EPG clear and EPG file pick handlers) | plain `playlist` reassigned after `await` | playlist |
 | [ ] | `libs/playlist/import/feature/src/lib/stalker-portal-import/stalker-portal-import.component.ts` (device-id derivation) | `form.patchValue` after `await`; template getters read `control.value`, which is not signal-backed | playlist |
-| [ ] | `libs/portal/stalker/feature/src/lib/stalker-live-stream-layout/stalker-live-stream-layout.component.ts` (favorites load) | `favorites` Map filled in a `subscribe` without `markForCheck`; the component is OnPush already, so this is a latent bug today | portal |
-| [ ] | `libs/portal/xtream/feature/src/lib/portal-channels-list/portal-channels-list.component.ts` (favorites load) | same pattern; the neighbouring `favoriteMarks.changes$` handler does call `markForCheck` | portal |
-| [ ] | same file, programme dialog `afterClosed` | deletes from `epgPrograms`/`currentProgramsProgress` after `await` without marking | portal |
+| [x] | `libs/portal/stalker/feature/src/lib/stalker-live-stream-layout/stalker-live-stream-layout.component.ts` (favorites load) | `favorites` Map filled in a `subscribe` without `markForCheck`; the component is OnPush already, so this is a latent bug today | portal |
+| [x] | `libs/portal/xtream/feature/src/lib/portal-channels-list/portal-channels-list.component.ts` (favorites load) | same pattern; the neighbouring `favoriteMarks.changes$` handler does call `markForCheck` | portal |
+| [x] | same file, programme dialog `afterClosed` | deletes from `epgPrograms`/`currentProgramsProgress` after `await` without marking | portal |
 | [ ] | `apps/web/src/app/settings/settings-backup.facade.ts` (backup import) | `change` listener on a detached file input → `hydrateFromStore()`; section templates read `form().value.theme`/`coverSize` | apps/web |
 | [ ] | `libs/ui/remote-control/src/lib/remote-control/remote-control.component.ts` | plain `isLoading`/`error`/`status` written after `await` and from a 2 s `setInterval` | only if `apps/remote-control-web` goes zoneless |