Added validation to the directory selection component

app/MindWork AI Studio/Assistants/ERI/AssistantERI.razor

@@ -346,4 +346,4 @@ else
 </MudText>
 
 <MudTextSwitch Label="Should we write the generated code to the file system?" Disabled="@this.IsNoneERIServerSelected" @bind-Value="@this.writeToFilesystem" LabelOn="Yes, please write or update all generated code to the file system" LabelOff="No, just show me the code" />
-<SelectDirectory Label="Base directory where to write the code" @bind-Directory="@this.baseDirectory" Disabled="@(this.IsNoneERIServerSelected || !this.writeToFilesystem)" DirectoryDialogTitle="Select the target directory for the ERI server"/>
+<SelectDirectory Label="Base directory where to write the code" @bind-Directory="@this.baseDirectory" Disabled="@(this.IsNoneERIServerSelected || !this.writeToFilesystem)" DirectoryDialogTitle="Select the target directory for the ERI server" Validation="@this.ValidateDirectory" />

app/MindWork AI Studio/Assistants/ERI/AssistantERI.razor.cs

@@ -740,6 +740,17 @@ public partial class AssistantERI : AssistantBaseCore
         return null;
     }
 
+    private string? ValidateDirectory(string path)
+    {
+        if(!this.writeToFilesystem)
+            return null;
+        
+        if(string.IsNullOrWhiteSpace(path))
+            return "Please provide a base directory for the ERI server to write files to.";
+        
+        return null;
+    }
+    
     private string GetMultiSelectionAuthText(List<Auth> selectedValues)
     {
         if(selectedValues.Count == 0)

app/MindWork AI Studio/Components/SelectDirectory.razor

@@ -4,6 +4,7 @@
         Text="@this.Directory"
         Label="@this.Label"
         ReadOnly="@true"
+        Validation="@this.Validation"
         Adornment="Adornment.Start"
         AdornmentIcon="@Icons.Material.Filled.Folder"
         UserAttributes="@SPELLCHECK_ATTRIBUTES"

app/MindWork AI Studio/Components/SelectDirectory.razor.cs

@@ -21,6 +21,9 @@ public partial class SelectDirectory : ComponentBase
     [Parameter]
     public string DirectoryDialogTitle { get; set; } = "Select Directory";
     
+    [Parameter]
+    public Func<string, string?> Validation { get; set; } = _ => null;
+    
     [Inject]
     private SettingsManager SettingsManager { get; init; } = null!;