Improve UI: Rename columns to Command and strip quotes

UI Improvements:
- Context Menus tab: Renamed "File" column to "Command" for consistency
- Both tabs now use "Command" column header (unified terminology)
- Added StripQuotesConverter utility to remove leading/trailing double quotes
- Applied converter to Command columns on both tabs for cleaner display

Column Changes:
- Context Menus: "File" → "Command" (with quote stripping)
- Startup Programs: "Command" column now strips quotes

Button Label Updates:
- Context Menus tab: "Export Context Menus" (was "Backup Context Menus")
- Startup Programs tab: "Export Startup Items" (was "Backup Startup Items")
- "Export" terminology is clearer than "Backup" for .REG file creation

Technical Details:
- Created Utilities/StripQuotesConverter.cs implementing IValueConverter
- Trims double quotes from start and end of strings using String.Trim('"')
- Added converter to Window.Resources in MainWindow.xaml
- Added converter to UserControl.Resources in StartupView.xaml
- Applied to FilePath binding in Context Menus and Command binding in Startup

Benefits:
- Consistent column naming across both tabs
- Cleaner display without unnecessary quotes around paths
- More professional appearance
- Better terminology with "Export" vs "Backup"

Author: mtg-eagletg

Utilities/StripQuotesConverter.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace ContextMenuEditor.Utilities;
+
+/// <summary>
+/// Converter that strips leading and trailing double quotes from strings.
+/// </summary>
+public class StripQuotesConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        if (value is string str && !string.IsNullOrEmpty(str))
+        {
+            return str.Trim('"');
+        }
+        return value;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}

Views/MainWindow.xaml

@@ -3,11 +3,16 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:vm="clr-namespace:ContextMenuEditor.ViewModels"
         xmlns:views="clr-namespace:ContextMenuEditor.Views"
+        xmlns:util="clr-namespace:ContextMenuEditor.Utilities"
         Title="Context Menu Editor" 
         Height="600" Width="900"
         MinHeight="400" MinWidth="700"
         WindowStartupLocation="CenterScreen">
 
+    <Window.Resources>
+        <util:StripQuotesConverter x:Key="StripQuotesConverter"/>
+    </Window.Resources>
+    
     <Window.DataContext>
         <vm:MainViewModel/>
     </Window.DataContext>
@@ -64,8 +69,8 @@
                             <DataGridTextColumn Header="Publisher" 
                                               Binding="{Binding Publisher}" 
                                               Width="150"/>
-                            <DataGridTextColumn Header="File" 
-                                              Binding="{Binding FilePath}" 
+                            <DataGridTextColumn Header="Command" 
+                                              Binding="{Binding FilePath, Converter={StaticResource StripQuotesConverter}}" 
                                               Width="*"
                                               MinWidth="150"/>
                         </DataGrid.Columns>
@@ -89,7 +94,7 @@
                                     Command="{Binding DeleteCommand}"
                                     IsEnabled="{Binding HasSelection}"/>
                             <Separator Margin="0,8"/>
-                            <Button Content="Backup Context Menus" 
+                            <Button Content="Export Context Menus" 
                                     Command="{Binding BackupCommand}"/>
                         </StackPanel>
                     </Border>

Views/StartupView.xaml

@@ -2,8 +2,13 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:vm="clr-namespace:ContextMenuEditor.ViewModels"
+             xmlns:util="clr-namespace:ContextMenuEditor.Utilities"
              Background="{DynamicResource WindowBackgroundBrush}">
 
+    <UserControl.Resources>
+        <util:StripQuotesConverter x:Key="StripQuotesConverter"/>
+    </UserControl.Resources>
+    
     <UserControl.DataContext>
         <vm:StartupViewModel/>
     </UserControl.DataContext>
@@ -40,7 +45,7 @@
                                       Binding="{Binding Publisher}" 
                                       Width="150"/>
                     <DataGridTextColumn Header="Command" 
-                                      Binding="{Binding Command}" 
+                                      Binding="{Binding Command, Converter={StaticResource StripQuotesConverter}}" 
                                       Width="*"
                                       MinWidth="200"/>
                     <DataGridTextColumn Header="Location" 
@@ -67,7 +72,7 @@
                             Command="{Binding DeleteCommand}"
                             IsEnabled="{Binding HasSelection}"/>
                     <Separator Margin="0,8"/>
-                    <Button Content="Backup Startup Items" 
+                    <Button Content="Export Startup Items" 
                             Command="{Binding BackupCommand}"/>
                 </StackPanel>
             </Border>