some changes for progress

Wino.Core.Domain/MenuItems/MergedAccountMenuItem.cs

@@ -20,14 +20,14 @@ public partial class MergedAccountMenuItem : MenuItemBase<MergedInbox, IMenuItem
     /// Total items to sync across all merged accounts.
     /// </summary>
     [ObservableProperty]
-    [NotifyPropertyChangedFor(nameof(SynchronizationProgress))]
+    [NotifyPropertyChangedFor(nameof(SynchronizationProgress), nameof(IsSynchronizationProgressVisible), nameof(IsProgressIndeterminate))]
     public partial int TotalItemsToSync { get; set; }
 
     /// <summary>
     /// Remaining items to sync across all merged accounts.
     /// </summary>
     [ObservableProperty]
-    [NotifyPropertyChangedFor(nameof(SynchronizationProgress))]
+    [NotifyPropertyChangedFor(nameof(SynchronizationProgress), nameof(IsSynchronizationProgressVisible), nameof(IsProgressIndeterminate))]
     public partial int RemainingItemsToSync { get; set; }
 
     /// <summary>
@@ -50,6 +50,17 @@ public partial class MergedAccountMenuItem : MenuItemBase<MergedInbox, IMenuItem
         }
     }
 
+    /// <summary>
+    /// Whether synchronization progress should be visible.
+    /// Visible when there's active synchronization (TotalItemsToSync > 0 or RemainingItemsToSync > 0).
+    /// </summary>
+    public bool IsSynchronizationProgressVisible => TotalItemsToSync > 0 || RemainingItemsToSync > 0;
+
+    /// <summary>
+    /// Whether progress should be indeterminate.
+    /// </summary>
+    public bool IsProgressIndeterminate => TotalItemsToSync == 0 && IsSynchronizationProgressVisible;
+
     [ObservableProperty]
     private string mergedAccountName;