feat(xtream): Xtream playlist refresh workflow

a dedicated refresh button and workflow for Xtream in the
recent playlists UI. Show a refresh icon only when the playlist has a
serverUrl. For Xtream playlists, prompt the user with a confirmation
dialog, delete locally cached categories and streams, show a toast that
the refresh started, and navigate to the playlist to trigger re-import.
Keep existing refresh IPC logic for non-Xtream (M3U/local) playlists.

Also add English translations for the Xtream refresh tooltip and dialog
messages, and surface errors via snackbar on failure.

This enables safe re-importing of remote Xtream playlists while preserving
favorites and recent items.

apps/electron-backend/src/app/events/database.events.ts

@@ -85,6 +85,7 @@ ipcMain.handle(
             username?: string;
             password?: string;
             serverUrl?: string;
+            lastUpdated?: string;
         }
     ) => {
         try {