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.

libs/services/src/lib/database-electron.service.ts

@@ -92,18 +92,24 @@ export class DatabaseService {
      */
     async updateXtreamPlaylistDetails(playlist: {
         id: string;
-        title: string;
+        title?: string;
         username?: string;
         password?: string;
         serverUrl?: string;
+        updateDate?: number;
     }): Promise<boolean> {
         try {
-            await window.electron.dbUpdatePlaylist(playlist.id, {
-                name: playlist.title,
-                username: playlist.username,
-                password: playlist.password,
-                serverUrl: playlist.serverUrl,
-            });
+            const updates: any = {};
+            if (playlist.title) updates.name = playlist.title;
+            if (playlist.username) updates.username = playlist.username;
+            if (playlist.password) updates.password = playlist.password;
+            if (playlist.serverUrl) updates.serverUrl = playlist.serverUrl;
+            if (playlist.updateDate !== undefined)
+                updates.lastUpdated = new Date(
+                    playlist.updateDate
+                ).toISOString();
+
+            await window.electron.dbUpdatePlaylist(playlist.id, updates);
             return true;
         } catch (error) {
             console.error('Error updating playlist details:', error);

libs/services/src/lib/playlists.service.ts

@@ -97,6 +97,9 @@ export class PlaylistsService {
                     ...(updatedPlaylist.password !== null
                         ? { password: updatedPlaylist.password }
                         : {}),
+                    ...(updatedPlaylist.updateDate !== undefined
+                        ? { updateDate: updatedPlaylist.updateDate }
+                        : {}),
                 })
             )
         );