feat: add external playback support and UI enhancements

- Integrated external playback functionality in category and detail views.
- Updated styles for play buttons to reflect different states (idle, launching, stop).
- Enhanced episode cards to indicate launching and active external playback states.
- Added new computed properties for managing external playback session states.
- Improved user interface for playback buttons with dynamic labels and icons based on playback state.
- Introduced new settings option to show external playback status bar on desktop.
- Updated translations for new features and UI elements.

apps/web/src/assets/i18n/de.json

@@ -250,6 +250,8 @@
         "REMOVE_ALL_DESCRIPTION": "Dadurch werden alle vorhandenen Wiedergabelisten aus der Anwendung entfernt.",
         "MPV_PLAYER_PATH": "MPV-Player-Pfad",
         "SHOW_CAPTIONS_DESCRIPTION": "Untertitel standardmäßig ein- oder ausblenden",
+        "SHOW_EXTERNAL_PLAYBACK_BAR": "Now-Playing-Fußleiste anzeigen",
+        "SHOW_EXTERNAL_PLAYBACK_BAR_DESCRIPTION": "Zeigt die Statusleiste für externe Player unten im Arbeitsbereich auf dem Desktop an.",
         "IMPORT_DATA": "Import",
         "ADD_EPG_SOURCE": "EPG-Quelle hinzufügen",
         "IMPORT_ERROR": "Importfehler. Bitte versuchen Sie es mit einer anderen Datei.",

apps/web/src/assets/i18n/en.json

@@ -194,6 +194,8 @@
         "LANGUAGE_DESCRIPTION": "Select language of the application",
         "THEME_DESCRIPTION": "Select visual theme of the application",
         "SHOW_CAPTIONS_DESCRIPTION": "Show or hide subtitles by default",
+        "SHOW_EXTERNAL_PLAYBACK_BAR": "Show now playing footer",
+        "SHOW_EXTERNAL_PLAYBACK_BAR_DESCRIPTION": "Keep the external-player status bar visible at the bottom of the workspace on desktop.",
         "VERSION_DESCRIPTION": "Current version of the application",
         "EPG_NOTE": "Currently EPG is available only in the electron-based version of IPTVnator.",
         "EPG_NOTE_URL_TEXT": "Check it here",