fix: update DataContext binding for TableEditorControl and enhance command execution logic

Author: fuzzzerd

src/SharpFM/App.axaml

@@ -6,6 +6,7 @@
 
     <Application.Styles>
         <FluentTheme />
+        <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml" />
         <StyleInclude Source="avares://AvaloniaEdit/Themes/Fluent/AvaloniaEdit.xaml" />
 
         <!-- Fluent 2 Design System Tokens and Styles -->

src/SharpFM/MainWindow.axaml

@@ -182,7 +182,7 @@
                             Document="{Binding SelectedClip.ScriptDocument}" />
                         <!-- Table editor for table/field clips -->
                         <Border IsVisible="{Binding SelectedClip.IsTableClip, FallbackValue=False}">
-                            <schema:TableEditorControl x:Name="tableEditorControl" />
+                            <schema:TableEditorControl DataContext="{Binding SelectedClip.TableEditor}" />
                         </Border>
                         <!-- Fallback XML editor for other clips -->
                         <AvaloniaEdit:TextEditor

src/SharpFM/MainWindow.axaml.cs

@@ -1,9 +1,7 @@
 using System;
-using System.ComponentModel;
 using Avalonia.Controls;
 using AvaloniaEdit;
 using AvaloniaEdit.TextMate;
-using SharpFM.Schema.Editor;
 using SharpFM.Scripting;
 using TextMateSharp.Grammars;
 
@@ -16,7 +14,6 @@ public partial class MainWindow : Window
     private TextMate.Installation? _xmlTextMateInstallation;
     private TextMate.Installation? _scriptTextMateInstallation;
     private Window? _xmlWindow;
-    private TableEditorControl? _tableEditor;
 
     public MainWindow()
     {
@@ -34,18 +31,6 @@ public MainWindow()
             _scriptController = new ScriptEditorController(scriptEditor);
         }
 
-        // Table editor — wire DataContext when selection changes
-        _tableEditor = this.FindControl<TableEditorControl>("tableEditorControl");
-
-        // Listen for SelectedClip changes to update table editor DataContext
-        DataContextChanged += (_, _) =>
-        {
-            if (DataContext is SharpFM.ViewModels.MainWindowViewModel mainVm)
-            {
-                mainVm.PropertyChanged += OnMainVmPropertyChanged;
-            }
-        };
-
         // "View XML" menu item
         var viewXmlItem = this.FindControl<MenuItem>("viewXmlMenuItem");
         if (viewXmlItem != null)
@@ -54,16 +39,6 @@ public MainWindow()
         }
     }
 
-    private void OnMainVmPropertyChanged(object? sender, PropertyChangedEventArgs e)
-    {
-        if (e.PropertyName != "SelectedClip" || _tableEditor == null) return;
-
-        var mainVm = sender as SharpFM.ViewModels.MainWindowViewModel;
-        var clip = mainVm?.SelectedClip;
-
-        _tableEditor.DataContext = clip?.IsTableClip == true ? clip.TableEditor : null;
-    }
-
     private void ShowXmlWindow()
     {
         var vm = (DataContext as SharpFM.ViewModels.MainWindowViewModel)?.SelectedClip;

src/SharpFM/Schema/Editor/TableEditorControl.axaml

@@ -5,6 +5,7 @@
              xmlns:editor="using:SharpFM.Schema.Editor"
              xmlns:model="using:SharpFM.Schema.Model"
              x:Class="SharpFM.Schema.Editor.TableEditorControl"
+             x:DataType="editor:TableEditorViewModel"
              x:CompileBindings="False"
              mc:Ignorable="d"
              d:DesignWidth="600" d:DesignHeight="400">

src/SharpFM/Schema/Editor/TableEditorViewModel.cs

@@ -27,6 +27,8 @@ public FmField? SelectedField
         {
             _selectedField = value;
             NotifyPropertyChanged();
+            (RemoveFieldCommand as RelayCommand)?.RaiseCanExecuteChanged();
+            (EditCalculationCommand as RelayCommand)?.RaiseCanExecuteChanged();
         }
     }