Partial Busy state for mark as read requests

Wino.Core/Requests/Mail/MarkReadRequest.cs

@@ -17,18 +17,30 @@ public record MarkReadRequest(MailCopy Item, bool IsRead) : MailRequestBase(Item
 
     public bool ExcludeMustHaveFolders => true;
 
+    /// <summary>
+    /// Gets whether this request represents an actual state change.
+    /// If the mail is already in the desired read state, no change is needed.
+    /// </summary>
+    public bool IsNoOp => Item.IsRead == IsRead;
+
     public override void ApplyUIChanges()
     {
+        // Skip UI update if the mail is already in the desired state
+        if (IsNoOp) return;
+
         Item.IsRead = IsRead;
 
-        WeakReferenceMessenger.Default.Send(new MailUpdatedMessage(Item, MailUpdateSource.Client));
+        WeakReferenceMessenger.Default.Send(new MailUpdatedMessage(Item, MailUpdateSource.ClientUpdated));
     }
 
     public override void RevertUIChanges()
     {
+        // Skip UI revert if this was a no-op request
+        if (IsNoOp) return;
+
         Item.IsRead = !IsRead;
 
-        WeakReferenceMessenger.Default.Send(new MailUpdatedMessage(Item, MailUpdateSource.Client));
+        WeakReferenceMessenger.Default.Send(new MailUpdatedMessage(Item, MailUpdateSource.ClientReverted));
     }
 }