Проведен аудит. Добавлено переключение треков

PlaylistShared.Pwa/Pages/SharedPlaylistView.razor

@@ -1,6 +1,17 @@
 @page "/shared/{token}"
 <PageTitle>@_playlist?.Title - Playlist Share</PageTitle>
 
+<HeadContent>
+    <meta property="og:title" content="@(_playlist?.Title ?? "Поделиться плейлистом")" />
+    <meta property="og:description" content="@($"Слушайте плейлист «{_playlist?.Title}» на Playlist Share")" />
+    @if (!string.IsNullOrEmpty(_playlist?.CoverUrl))
+    {
+        <meta property="og:image" content="@_playlist.CoverUrl" />
+    }
+    <meta property="og:url" content="@Navigation.Uri" />
+    <meta property="og:type" content="music.playlist" />
+</HeadContent>
+
 @using PlaylistShared.Pwa.Components.Common
 @using PlaylistShared.Pwa.Components.Global
 @using PlaylistShared.Pwa.Components.SharedPlaylist
@@ -245,7 +256,8 @@
                         Style="min-height: 0;">
                 <RowTemplate>
                     <MudTd Class="py-1 px-0" Style="width: 100%;">
-                        <TrackItem Track="@context" PlaylistShareToken="@Token" CanPlay="@_canPlay" />
+                        <TrackItem Track="@context" PlaylistShareToken="@Token" CanPlay="@_canPlay"
+                                   AddedByName="@(_trackAdditions.TryGetValue(context.TrackId, out var n) ? n : null)" />
                     </MudTd>
                     @if (_canRemove)
                     {
@@ -444,6 +456,10 @@
     /// </summary>
     private List<YandexTrack> _tracks = new();
     /// <summary>
+    /// Словарь trackId → имя пользователя, добавившего трек.
+    /// </summary>
+    private Dictionary<string, string?> _trackAdditions = new();
+    /// <summary>
     /// Продолжительность плейлиста.
     /// </summary>
     long _playlistDurationMs;
@@ -621,6 +637,15 @@
                 _existingTrackIds = _tracks.Select(t => t.TrackId).ToHashSet();
                 _playlistDurationMs = _tracks.Sum(t => t.DurationMs);
                 _playlistTrackCount = _tracks.Count();
+                AudioPlayerService.SetQueue(_tracks, shareToken: Token);
+
+                try
+                {
+                    var additionsResp = await Http.GetFromJsonAsync<ApiResponse<Dictionary<string, string?>>>($"/api/sharedplaylist/{Token}/additions");
+                    if (additionsResp?.Success == true && additionsResp.Data != null)
+                        _trackAdditions = additionsResp.Data;
+                }
+                catch { }
             }
             else
             {