fix: dispatch Summary UI updates to UI thread on network change

ClearOnDisconnect() and SetActiveAdapter() modify ObservableCollections
bound to LiveCharts and the process list. They were being called from
the ETW background thread via the PropertyChanged chain, racing with
the DispatcherTimer's FlushPendingTraffic() tick on the UI thread.

This corrupted collection state after toggling adapters (e.g. Ethernet
→ off → WiFi → off → Ethernet), causing the Summary page to go silent.

Fix: post NetworkStatus, ClearOnDisconnect, and SetActiveAdapter to
Dispatcher.UIThread in OnNetworkChanged. Heavy work (ETW, PeriodicWork,
History.ReloadProfiles) stays on the background thread.
fix #107

Author: Ashfaaq18

OpenNetMeter/ViewModels/MainWindowViewModel.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Reflection;
 using System.Windows.Input;
+using Avalonia.Threading;
 using OpenNetMeter.Services;
 using OpenNetMeter.Core.ViewModels;
 using OpenNetMeter.PlatformAbstractions;
@@ -137,13 +138,20 @@ private void OnNetworkChanged(object? sender, NetworkSnapshotChangedEventArgs e)
     {
         if (string.IsNullOrWhiteSpace(e.AdapterName))
         {
-            NetworkStatus = "Disconnected";
-            Summary.ClearOnDisconnect();
+            Dispatcher.UIThread.Post(() =>
+            {
+                NetworkStatus = "Disconnected";
+                Summary.ClearOnDisconnect();
+            });
             return;
         }
 
-        NetworkStatus = $"Connected : {e.AdapterName}";
-        Summary.SetActiveAdapter(e.AdapterName);
+        var adapterName = e.AdapterName;
+        Dispatcher.UIThread.Post(() =>
+        {
+            NetworkStatus = $"Connected : {adapterName}";
+            Summary.SetActiveAdapter(adapterName);
+        });
         History.ReloadProfiles();
     }