fix: propagate YouTube feed cancellation

Morpheus.Tests/YoutubeFeedServiceTests.cs

@@ -0,0 +1,17 @@
+using Morpheus.Services;
+
+namespace Morpheus.Tests;
+
+public class YoutubeFeedServiceTests
+{
+    [Fact]
+    public async Task FetchFeedAsync_WhenCallerCancels_PropagatesCancellation()
+    {
+        YoutubeFeedService service = new(new LogsService(new LogQueue()));
+        using CancellationTokenSource cts = new();
+        cts.Cancel();
+
+        await Assert.ThrowsAnyAsync<OperationCanceledException>(() =>
+            service.FetchFeedAsync("channel-id", cts.Token));
+    }
+}

Services/YoutubeFeedService.cs

@@ -43,6 +43,10 @@ public record VideoEntry(string VideoId, string Title, string Link, DateTime Pub
 
             return (channelTitle, entries);
         }
+        catch (OperationCanceledException) when (ct.IsCancellationRequested)
+        {
+            throw;
+        }
         catch (Exception ex)
         {
             logsService.Log($"Failed to fetch YouTube feed for {channelId}: {ex.Message}", LogSeverity.Warning);