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.
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