Add workspaces & persistent chats (#23)

app/MindWork AI Studio/Components/CommonDialogs/SingleInputDialog.razor

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+<MudDialog>
+    <DialogContent>
+        <MudText Typo="Typo.body1">@this.Message</MudText>
+        <MudTextField T="string" @bind-Text="@this.UserInput" Variant="Variant.Outlined" AutoGrow="@false" Lines="1" Label="Chat name" AutoFocus="@true"/>
+    </DialogContent>
+    <DialogActions>
+        <MudButton OnClick="@this.Cancel" Variant="Variant.Filled">Cancel</MudButton>
+        <MudButton OnClick="@this.Confirm" Variant="Variant.Filled" Color="@this.ConfirmColor">@this.ConfirmText</MudButton>
+    </DialogActions>
+</MudDialog>

app/MindWork AI Studio/Components/CommonDialogs/SingleInputDialog.razor.cs

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+using Microsoft.AspNetCore.Components;
+
+namespace AIStudio.Components.CommonDialogs;
+
+public partial class SingleInputDialog : ComponentBase
+{
+    [CascadingParameter]
+    private MudDialogInstance MudDialog { get; set; } = null!;
+
+    [Parameter]
+    public string Message { get; set; } = string.Empty;
+    
+    [Parameter]
+    public string UserInput { get; set; } = string.Empty;
+    
+    [Parameter]
+    public string ConfirmText { get; set; } = "OK";
+
+    [Parameter]
+    public Color ConfirmColor { get; set; } = Color.Error;
+
+    private void Cancel() => this.MudDialog.Cancel();
+    
+    private void Confirm() => this.MudDialog.Close(DialogResult.Ok(this.UserInput));
+}

app/MindWork AI Studio/Components/CommonDialogs/WorkspaceSelectionDialog.razor

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+<MudDialog>
+    <DialogContent>
+        <MudText Typo="Typo.body1">@this.Message</MudText>
+        <MudList Clickable="@true" @bind-SelectedValue="@this.selectedWorkspace">
+            @foreach (var (workspaceName, workspaceId) in this.workspaces)
+            {
+                <MudListItem Text="@workspaceName" Icon="@Icons.Material.Filled.Description" Value="@workspaceId" />
+            }
+        </MudList>
+    </DialogContent>
+    <DialogActions>
+        <MudButton OnClick="@this.Cancel" Variant="Variant.Filled">Cancel</MudButton>
+        <MudButton OnClick="@this.Confirm" Variant="Variant.Filled" Color="Color.Info">@this.ConfirmText</MudButton>
+    </DialogActions>
+</MudDialog>

app/MindWork AI Studio/Components/CommonDialogs/WorkspaceSelectionDialog.razor.cs

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+using System.Text;
+
+using AIStudio.Settings;
+
+using Microsoft.AspNetCore.Components;
+
+namespace AIStudio.Components.CommonDialogs;
+
+public partial class WorkspaceSelectionDialog : ComponentBase
+{
+    [CascadingParameter]
+    private MudDialogInstance MudDialog { get; set; } = null!;
+
+    [Parameter]
+    public string Message { get; set; } = string.Empty;
+    
+    [Parameter]
+    public Guid SelectedWorkspace { get; set; } = Guid.Empty;
+    
+    [Parameter]
+    public string ConfirmText { get; set; } = "OK";
+    
+    private readonly Dictionary<string, Guid> workspaces = new();
+    private object? selectedWorkspace;
+
+    #region Overrides of ComponentBase
+
+    protected override async Task OnInitializedAsync()
+    {
+        this.selectedWorkspace = this.SelectedWorkspace;
+        
+        // Get the workspace root directory: 
+        var workspaceDirectories = Path.Join(SettingsManager.DataDirectory, "workspaces");
+        if(!Directory.Exists(workspaceDirectories))
+        {
+            await base.OnInitializedAsync();
+            return;
+        }
+
+        // Enumerate the workspace directories:
+        foreach (var workspaceDirPath in Directory.EnumerateDirectories(workspaceDirectories))
+        {
+            // Read the `name` file:
+            var workspaceNamePath = Path.Join(workspaceDirPath, "name");
+            var workspaceName = await File.ReadAllTextAsync(workspaceNamePath, Encoding.UTF8);
+            
+            // Add the workspace to the list:
+            this.workspaces.Add(workspaceName, Guid.Parse(Path.GetFileName(workspaceDirPath)));
+        }
+
+        this.StateHasChanged();
+        await base.OnInitializedAsync();
+    }
+
+    #endregion
+
+    private void Cancel() => this.MudDialog.Cancel();
+    
+    private void Confirm() => this.MudDialog.Close(DialogResult.Ok(this.selectedWorkspace is Guid workspaceId ? workspaceId : default));
+}