Вынесена логика формирования обложки

PlaylistShared.Pwa/Components/Common/TrackCoverWithPlay.razor

@@ -6,7 +6,7 @@
      @onmouseleave="HandleMouseLeave"
      style="position: relative; display: inline-block; cursor: pointer;">
     
-    <MudImage Src="@FormatCoverUrl(CoverUrl)" Height="@Height" Width="@Width" Class="rounded" Style="display: block;" />
+    <MudImage Src="@CoverUrl.FormatCoverUrl(Width, Height)" Height="@Height" Width="@Width" Class="rounded" Style="display: block;" />
     
     @if (_isHovered || IsCurrentTrackPlaying)
     {
@@ -62,10 +62,4 @@
     {
         InvokeAsync(StateHasChanged);
     }
-    
-    private string FormatCoverUrl(string? url)
-    {
-        if (string.IsNullOrEmpty(url)) return "";
-        return "https://" + url.Replace("%%", $"{Width}x{Height}");
-    }
 }

PlaylistShared.Pwa/Components/SharedPlaylist/PlaylistHeader.razor

@@ -11,7 +11,7 @@
 <div style="display: flex; gap: 16px; align-items: center;">
     @if (!string.IsNullOrEmpty(Playlist?.CoverUrl))
     {
-        <MudImage Src="@FormatCoverUrl(Playlist.CoverUrl, "80x80")" Height="80" Width="80" Class="rounded" />
+        <MudImage Src="@Playlist.CoverUrl.FormatCoverUrl(80, 80)" Height="80" Width="80" Class="rounded" />
     }
     <div>
         <div style="display: flex; align-items: center; gap: 8px; flex-wrap: wrap;">
@@ -144,10 +144,4 @@
             await OnPermissionsChanged.InvokeAsync();
         }
     }
-
-    private string FormatCoverUrl(string? url, string size)
-    {
-        if (string.IsNullOrEmpty(url)) return "";
-        return "https://" + url.Replace("%%", size);
-    }
 }

PlaylistShared.Pwa/Components/SharedPlaylist/TracksTable.razor

@@ -30,7 +30,7 @@
                 }
                 else
                 {
-                    <MudImage Src="@FormatCoverUrl(context.CoverUri, "50x50")" Height="50" Width="50" Class="rounded" />
+                    <MudImage Src="@context.CoverUri.FormatCoverUrl(50, 50)" Height="50" Width="50" Class="rounded" />
                 }
             }
         </MudTd>
@@ -141,12 +141,6 @@
         await OnPlayTrack.InvokeAsync(trackId);
     }
 
-    private string FormatCoverUrl(string? url, string size)
-    {
-        if (string.IsNullOrEmpty(url)) return "";
-        return "https://" + url.Replace("%%", size);
-    }
-
     private string FormatDuration(long ms)
     {
         var seconds = ms / 1000;

PlaylistShared.Pwa/Extensions/StringExtensions.cs

@@ -0,0 +1,19 @@
+namespace PlaylistShared.Pwa.Extensions;
+
+public static class StringExtensions
+{
+    /// <summary>
+    /// Преобразует шаблон URL обложки Яндекс.Музыки в полный URL с указанным размером.
+    /// </summary>
+    /// <param name="coverUri">Шаблон URL (например, "avatars.yandex.net/get-music-content/.../%%")</param>
+    /// <param name="width">Желаемая ширина обложки (по умолчанию 200)</param>
+    /// <param name="height">Желаемая высота обложки (по умолчанию 200)</param>
+    /// <returns>Полный URL обложки или пустую строку, если входная строка null или пуста.</returns>
+    public static string FormatCoverUrl(this string? coverUri, int width = 200, int height = 200)
+    {
+        if (string.IsNullOrEmpty(coverUri))
+            return string.Empty;
+
+        return "https://" + coverUri.Replace("%%", $"{width}x{height}");
+    }
+}

PlaylistShared.Pwa/_Imports.razor

@@ -13,4 +13,5 @@
 @using MudBlazor
 @using Microsoft.AspNetCore.Authorization
 @using PlaylistShared.Shared
-@using PlaylistShared.Pwa.Components
+@using PlaylistShared.Pwa.Components
+@using PlaylistShared.Pwa.Extensions