v1.15 — PowerShell edition + repo restructure

- New powershell/InstaSoftOfficeTool.ps1: single-file WPF GUI version
  - Same Fluent Design UI, no compilation needed
  - Runs on any Windows 7+ with PowerShell 5.1 (built-in)
  - Chrome won't flag .ps1 files as "rarely downloaded"
  - Auto-elevates to admin
- Moved C# source to src/ subfolder
- Updated .gitignore for nested bin/obj folders

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Pages/ProductKeyPage.xaml.cs

@@ -0,0 +1,149 @@
+using System.Text.RegularExpressions;
+using System.Windows;
+using System.Windows.Controls;
+using InstaSoftOfficeTool.Models;
+
+namespace InstaSoftOfficeTool.Pages
+{
+    public partial class ProductKeyPage : Page, IWizardPage
+    {
+        private readonly MainWindow _main;
+        private readonly InstallConfig _config;
+        private readonly TextBox[] _keyBoxes;
+        private bool _suppressAutoTab;
+
+        public ProductKeyPage(MainWindow main, InstallConfig config)
+        {
+            InitializeComponent();
+            _main = main;
+            _config = config;
+            _keyBoxes = new[] { Key1, Key2, Key3, Key4, Key5 };
+
+            if (!string.IsNullOrEmpty(_config.ProductKey))
+            {
+                var parts = _config.ProductKey.Split('-');
+                for (int i = 0; i < parts.Length && i < 5; i++)
+                {
+                    _keyBoxes[i].Text = parts[i];
+                }
+            }
+
+            // Intercept paste on all boxes
+            foreach (var box in _keyBoxes)
+            {
+                DataObject.AddPastingHandler(box, OnPaste);
+            }
+        }
+
+        private void OnPaste(object sender, DataObjectPastingEventArgs e)
+        {
+            if (!e.DataObject.GetDataPresent(typeof(string))) return;
+
+            var pasted = (string)e.DataObject.GetData(typeof(string));
+            var allAlphaNum = Regex.Replace(pasted, "[^A-Za-z0-9]", "");
+
+            // Only intercept if it looks like a full key (more than 5 chars)
+            if (allAlphaNum.Length <= 5) return;
+
+            e.CancelCommand(); // prevent default paste
+
+            _suppressAutoTab = true;
+            for (int i = 0; i < 5; i++)
+            {
+                int start = i * 5;
+                if (start < allAlphaNum.Length)
+                {
+                    int len = System.Math.Min(5, allAlphaNum.Length - start);
+                    _keyBoxes[i].Text = allAlphaNum.Substring(start, len).ToUpper();
+                }
+            }
+            _suppressAutoTab = false;
+            _keyBoxes[4].Focus();
+            _keyBoxes[4].CaretIndex = _keyBoxes[4].Text.Length;
+            ValidationMessage.Visibility = Visibility.Collapsed;
+        }
+
+        private void KeyBox_TextChanged(object sender, TextChangedEventArgs e)
+        {
+            if (_suppressAutoTab) return;
+
+            var tb = (TextBox)sender;
+            var raw = tb.Text;
+
+            // Clean non-alphanumeric chars
+            var cleaned = Regex.Replace(raw, "[^A-Za-z0-9]", "");
+            if (cleaned != raw)
+            {
+                _suppressAutoTab = true;
+                tb.Text = cleaned;
+                tb.CaretIndex = cleaned.Length;
+                _suppressAutoTab = false;
+            }
+
+            // Auto-tab to next box when 5 chars entered
+            if (tb.Text.Length == 5)
+            {
+                for (int i = 0; i < _keyBoxes.Length - 1; i++)
+                {
+                    if (_keyBoxes[i] == tb)
+                    {
+                        _keyBoxes[i + 1].Focus();
+                        break;
+                    }
+                }
+            }
+
+            ValidationMessage.Visibility = Visibility.Collapsed;
+        }
+
+        private void CbSkipKey_Changed(object sender, RoutedEventArgs e)
+        {
+            bool skip = CbSkipKey.IsChecked == true;
+            foreach (var box in _keyBoxes)
+            {
+                box.IsEnabled = !skip;
+                if (skip) box.Text = "";
+            }
+            ValidationMessage.Visibility = Visibility.Collapsed;
+        }
+
+        public bool Validate()
+        {
+            if (CbSkipKey.IsChecked == true)
+            {
+                _config.ProductKey = null;
+                return true;
+            }
+
+            bool allEmpty = true;
+            foreach (var box in _keyBoxes)
+            {
+                if (!string.IsNullOrEmpty(box.Text))
+                {
+                    allEmpty = false;
+                    break;
+                }
+            }
+
+            if (allEmpty)
+            {
+                _config.ProductKey = null;
+                return true;
+            }
+
+            foreach (var box in _keyBoxes)
+            {
+                if (box.Text.Length != 5 || !Regex.IsMatch(box.Text, "^[A-Za-z0-9]{5}$"))
+                {
+                    ValidationMessage.Text = "A term\u00e9kkulcsnak 5 x 5 alfanumerikus karakterb\u0151l kell \u00e1llnia.";
+                    ValidationMessage.Visibility = Visibility.Visible;
+                    return false;
+                }
+            }
+
+            _config.ProductKey = string.Join("-",
+                Key1.Text, Key2.Text, Key3.Text, Key4.Text, Key5.Text).ToUpper();
+            return true;
+        }
+    }
+}