重构任务节点对话框和JS脚本选择窗口，调整命名空间，优化代码结构

BetterGenshinImpact/View/Windows/GearTask/JsScriptSelectionWindow.xaml.cs

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+using System.Windows;
+using BetterGenshinImpact.ViewModel.Windows.GearTask;
+using Wpf.Ui.Controls;
+using JsScriptSelectionViewModel = BetterGenshinImpact.ViewModel.Windows.GearTask.JsScriptSelectionViewModel;
+
+namespace BetterGenshinImpact.View.Windows.GearTask;
+
+public partial class JsScriptSelectionWindow : FluentWindow
+{
+    public JsScriptSelectionViewModel ViewModel { get; }
+    
+    public JsScriptInfo? SelectedScript => ViewModel.SelectedScript;
+    
+    public bool DialogResult { get; private set; }
+
+    public JsScriptSelectionWindow()
+    {
+        ViewModel = new JsScriptSelectionViewModel();
+        DataContext = ViewModel;
+        InitializeComponent();
+    }
+
+    private void OnOkClick(object sender, RoutedEventArgs e)
+    {
+        if (ViewModel.SelectedScript != null)
+        {
+            DialogResult = true;
+            Close();
+        }
+        else
+        {
+            Wpf.Ui.Violeta.Controls.Toast.Warning("请选择一个JS脚本");
+        }
+    }
+
+    private void OnCancelClick(object sender, RoutedEventArgs e)
+    {
+        DialogResult = false;
+        Close();
+    }
+}