chore(codebase): full cleanup pass

backend/Modules/Messaging/Handlers/ChangeMessage.cs

@@ -39,15 +39,15 @@ public class ChangeMessage(
         ChangeMessageRequest req,
         CancellationToken ct)
     {
-        var message = await context.Messages.FirstOrDefaultAsync(x => x.Id == req.Id, ct);
-        
+        Message? message = await context.Messages.FirstOrDefaultAsync(x => x.Id == req.Id, ct);
+
         if (message is null)
         {
             await SendNotFoundAsync(ct);
             return;
         }
-        
-        var userId = HttpContext.User.GetUserId();
+
+        Guid userId = HttpContext.User.GetUserId();
         if (message.CreatedBy != userId)
         {
             await SendForbiddenAsync(ct);
@@ -58,7 +58,7 @@ public class ChangeMessage(
         message.Value = req.Message;
 
         context.Update(message);
-        
+
         await context.SaveChangesAsync(ct);
     }
 }