feat: add strip country prefix setting (#1162)

* feat: add strip country prefix setting

* feat: scope country-prefix stripping to live content and cover missing surfaces

- narrow the heuristic: pipes always strip, dash/colon separators only
  when the prefix is a short uppercase tag ("UK - BBC One" strips,
  "Sky - Sports F1" and "Mission: Impossible - Fallout" stay intact)
- fall back to the original name when stripping would leave nothing
- scope stripping to live content only: grid type (live/itv/radio),
  playback isLive, external sessions without contentInfo, dashboard
  cards with contentType 'live'
- cover previously missed surfaces: M3U player EPG timeline header,
  M3U inline player title, radio player, dashboard live rails
- replace hardcoded settings strings with translate keys and add
  SETTINGS.STRIP_COUNTRY_PREFIX(_DESCRIPTION) to all 18 locales
- add unit specs for the utility plus regression specs for
  channel-list-item and external-playback-dock

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

* test: cover strip-country-prefix call sites for codecov

- dashboard-rail: new spec for cardTitle live/movie/series scoping
- grid-list: strip enabled/disabled, VOD passthrough, 'No name' fallback
- portal-inline-player: live strip vs VOD passthrough
- unified-live-tab: timeline channel name strip + M3U name precedence
- video-player: timeline/radio/inline titles with the setting on and off
- settings-store: default false + persisted true round-trip
- settings-form.utils: new spec for form default and ?? false fallback

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

---------

Co-authored-by: 4gray <serega05@gmail.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

libs/shared/interfaces/src/lib/settings.interface.ts

@@ -92,6 +92,8 @@ export interface Settings {
     startupBehavior: StartupBehavior;
     /** Show the desktop footer bar for external playback status */
     showExternalPlaybackBar?: boolean;
+    /** Strip country/group prefixes like "US | " or "UK - " from channel names */
+    stripCountryPrefix?: boolean;
     theme: Theme;
     mpvPlayerPath: string;
     /**