fix: 修复配置名为null时添加配置报错，留空时以当前时间作为配置名

src/MaaWpfGui/Helper/ConfigurationHelper.cs

@@ -316,6 +316,11 @@ namespace MaaWpfGui.Helper
 
         public static bool AddConfiguration(string configName, string copyFrom = null)
         {
+            if (string.IsNullOrEmpty(configName))
+            {
+                return false;
+            }
+
             if (_kvsMap.ContainsKey(configName))
             {
                 _logger.Warning("Configuration {ConfigName} already exists", configName);

src/MaaWpfGui/ViewModels/UI/SettingsViewModel.cs

@@ -930,6 +930,7 @@ namespace MaaWpfGui.ViewModels.UI
 
         public void AddConfiguration()
         {
+            NewConfigurationName ??= DateTime.Now.ToString("yy/MM/dd HH:mm:ss");
             if (ConfigurationHelper.AddConfiguration(NewConfigurationName, CurrentConfiguration))
             {
                 ConfigurationList.Add(new CombinedData { Display = NewConfigurationName, Value = NewConfigurationName });

src/MaaWpfGui/Views/UserControl/ConfigurationMgrUserControl.xaml

@@ -56,7 +56,7 @@
                 </DataTemplate>
             </ComboBox.ItemTemplate>
         </ComboBox>
-        <Grid Width="200">
+        <Grid Width="250">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="Auto" />
                 <ColumnDefinition Width="*" />
@@ -65,6 +65,7 @@
             <controls:TextBlock Grid.Column="0" Text="{DynamicResource ConfigurationName}" />
             <TextBox
                 Grid.Column="1"
+                Width="Auto"
                 Margin="10"
                 Text="{Binding NewConfigurationName, UpdateSourceTrigger=PropertyChanged}">
                 <TextBox.InputBindings>