Feature: Filter 6 GHz network / refactor code (#2928)

* Feature: Filter 6 GHz network / refactor code

* Docs: #2928

* Docs: Improve wifi page

Author: BornToBeRoot

Source/NETworkManager.Converters/WiFiChannelCenterFrequencyToChannelStringConverter.cs

@@ -1,17 +1,14 @@
 using System;
 using System.Globalization;
 using System.Windows.Data;
-using NETworkManager.Models.Network;
 
 namespace NETworkManager.Converters;
 
 public sealed class WiFiChannelCenterFrequencyToChannelStringConverter : IValueConverter
 {
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
     {
-        return value is not int channelCenterFrequencyInKilohertz
-            ? "-/-"
-            : $"{WiFi.GetChannelFromChannelFrequency(channelCenterFrequencyInKilohertz)}";
+        return value is not int channel ? "-/-" : $"{channel}";
     }
 
     public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

Source/NETworkManager.Converters/WiFiChannelCenterFrequencyToFrequencyStringConverter.cs

@@ -1,17 +1,14 @@
 using System;
 using System.Globalization;
 using System.Windows.Data;
-using NETworkManager.Models.Network;
 
 namespace NETworkManager.Converters;
 
 public sealed class WiFiChannelCenterFrequencyToFrequencyStringConverter : IValueConverter
 {
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
     {
-        return value is not int channelCenterFrequencyInKilohertz
-            ? "-/-"
-            : $"{WiFi.ConvertChannelFrequencyToGigahertz(channelCenterFrequencyInKilohertz)} GHz";
+        return value is not double frequency ? "-/-" : $"{frequency} GHz";
     }
 
     public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)