Fix cache issues with creator's logo and banner

backend/src/Web/Features/Contents/Handlers/ChangeLogo.cs

@@ -8,6 +8,10 @@ public record ChangeLogoRequest(
     Guid CreatorId,
     IFormFile File);
 
+[PublicAPI]
+public record ChangeLogoResponse(
+    string BlobUrl);
+
 [PublicAPI]
 public sealed class ChangeLogoRequestValidator : Validator<ChangeLogoRequest>
 {
@@ -61,10 +65,12 @@ public class ChangeLogoHandler(
             request.File.ContentType,
             ct);
 
-        creator.Images.Logo = blobUrl;
+        creator.Images.Logo = $"{blobUrl}?t={DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()}";
 
         await context.SaveChangesAsync(ct);
 
-        await SendOkAsync(blobUrl, ct);
+        await SendOkAsync(
+            new ChangeLogoResponse(blobUrl),
+            ct);
     }
 }