feat: move test buttons to right panel, add user auth dialog for reports

Move Start/Stop/Report buttons from the middle panel to the top of
TestPanelView (automated tests section), matching the old application
layout. Remove inline Operator/Client text fields — operator identity
now comes from a UserCheckDialog (username/password) shown before the
existing ReportDialog. Add credential storage to ConfigurationService.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ViewModels/Dialogs/UserCheckViewModel.cs

@@ -0,0 +1,81 @@
+using System.Windows;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using HC_APTBS.Services;
+
+namespace HC_APTBS.ViewModels.Dialogs
+{
+    /// <summary>
+    /// ViewModel for the user authentication dialog shown before report generation.
+    /// Validates operator credentials against the stored user list.
+    /// </summary>
+    public sealed partial class UserCheckViewModel : ObservableObject
+    {
+        private readonly IConfigurationService _config;
+
+        /// <summary>Initialises the dialog, optionally pre-filling the last used username.</summary>
+        public UserCheckViewModel(IConfigurationService config, string lastUsername = "")
+        {
+            _config   = config;
+            _username = lastUsername;
+        }
+
+        // ── Bindable properties ───────────────────────────────────────────────────
+
+        /// <summary>Username entered by the operator.</summary>
+        [ObservableProperty]
+        [NotifyCanExecuteChangedFor(nameof(AcceptCommand))]
+        private string _username = string.Empty;
+
+        /// <summary>Password entered by the operator (set from code-behind PasswordChanged handler).</summary>
+        [ObservableProperty]
+        [NotifyCanExecuteChangedFor(nameof(AcceptCommand))]
+        private string _password = string.Empty;
+
+        // ── Dialog result ─────────────────────────────────────────────────────────
+
+        /// <summary>True if the user authenticated successfully.</summary>
+        public bool Accepted { get; private set; }
+
+        /// <summary>The validated username, available after <see cref="Accepted"/> is true.</summary>
+        public string AuthenticatedUser { get; private set; } = string.Empty;
+
+        // ── Commands ──────────────────────────────────────────────────────────────
+
+        /// <summary>Validates credentials and closes the dialog on success.</summary>
+        [RelayCommand(CanExecute = nameof(CanAccept))]
+        private void Accept()
+        {
+            if (_config.ValidateUser(Username, Password))
+            {
+                AuthenticatedUser = Username;
+                Accepted = true;
+                RequestClose?.Invoke();
+            }
+            else
+            {
+                MessageBox.Show(
+                    "Invalid username or password.\n(Both are case-sensitive.)",
+                    "Authentication Error",
+                    MessageBoxButton.OK,
+                    MessageBoxImage.Stop);
+            }
+        }
+
+        private bool CanAccept() => !string.IsNullOrWhiteSpace(Username)
+                                 && !string.IsNullOrEmpty(Password);
+
+        /// <summary>Cancels authentication and closes the dialog.</summary>
+        [RelayCommand]
+        private void Cancel()
+        {
+            Accepted = false;
+            RequestClose?.Invoke();
+        }
+
+        // ── Events ────────────────────────────────────────────────────────────────
+
+        /// <summary>Raised when the dialog should close itself.</summary>
+        public event System.Action? RequestClose;
+    }
+}

ViewModels/MainViewModel.cs

@@ -9,6 +9,8 @@ using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using HC_APTBS.Models;
 using HC_APTBS.Services;
+using HC_APTBS.ViewModels.Dialogs;
+using HC_APTBS.Views.Dialogs;
 
 namespace HC_APTBS.ViewModels
 {
@@ -43,6 +45,9 @@ namespace HC_APTBS.ViewModels
 
         private CancellationTokenSource? _testCts;
 
+        /// <summary>Remembers the last authenticated username to pre-fill the next auth dialog.</summary>
+        private string _lastAuthenticatedUser = string.Empty;
+
         // ── Child ViewModels ──────────────────────────────────────────────────────
 
         /// <summary>ViewModel for pump selection and K-Line ECU identification.</summary>
@@ -331,14 +336,6 @@ namespace HC_APTBS.ViewModels
         /// <summary>Verbose status message from bench/test operations.</summary>
         [ObservableProperty] private string _verboseStatus    = string.Empty;
 
-        // ── Operator / client info ────────────────────────────────────────────────
-
-        /// <summary>Operator name for report generation.</summary>
-        [ObservableProperty] private string _operatorName = string.Empty;
-
-        /// <summary>Client name for report generation.</summary>
-        [ObservableProperty] private string _clientName   = string.Empty;
-
         // ── Test saved state ──────────────────────────────────────────────────────
 
         /// <summary>True when the current test results have been saved to a report.</summary>
@@ -407,14 +404,28 @@ namespace HC_APTBS.ViewModels
         private void GenerateReport()
         {
             if (CurrentPump == null) return;
+
+            // Step 1: Authenticate operator.
+            var authVm   = new UserCheckViewModel(_config, _lastAuthenticatedUser);
+            var authDlg  = new UserCheckDialog(authVm) { Owner = Application.Current.MainWindow };
+            authDlg.ShowDialog();
+            if (!authVm.Accepted) return;
+            _lastAuthenticatedUser = authVm.AuthenticatedUser;
+
+            // Step 2: Collect report details (client, company, observations).
+            var reportVm  = new ReportViewModel(_config) { OperatorName = authVm.AuthenticatedUser };
+            var reportDlg = new ReportDialog(reportVm) { Owner = Application.Current.MainWindow };
+            reportDlg.ShowDialog();
+            if (!reportVm.Accepted) return;
+
             try
             {
                 string desktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
-                string path    = _pdf.GenerateReport(CurrentPump, OperatorName, ClientName, desktop);
+                string path    = _pdf.GenerateReport(
+                    CurrentPump, reportVm.OperatorName, reportVm.SelectedClientName, desktop);
                 _log.Info(LogId, $"Report saved: {path}");
                 IsTestSaved = true;
 
-                // Open the generated PDF with the default viewer.
                 System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(path)
                     { UseShellExecute = true });
             }