Initial commit: NFC Actions Windows tray application

Implement PC/SC-based NFC card reader monitoring application with WPF UI. Features include:
- System tray integration with single-click to open main window
- Dynamic reader detection and management with enable/disable per reader
- NDEF payload extraction supporting Type 2 and Type 4 tags
- Auto-detection of block sizes (4-byte vs 16-byte) for different reader types
- Configurable actions: copy to clipboard, launch URLs, keyboard input simulation
- URI record type detection - only launches browser for actual URI records
- Real-time activity logging with color-coded levels (Debug, Info, Warning, Error)
- File-based debug logging for troubleshooting
- Settings persistence between sessions
- Dangerous Things branding with custom icons and clickable logo

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

NfcActions/MainWindow.xaml.cs

@@ -0,0 +1,42 @@
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Input;
+using NfcActions.ViewModels;
+
+namespace NfcActions;
+
+/// <summary>
+/// Interaction logic for MainWindow.xaml
+/// </summary>
+public partial class MainWindow : Window
+{
+    public MainWindow(MainViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+    }
+
+    private void Window_Closing(object? sender, CancelEventArgs e)
+    {
+        // Minimize to tray instead of closing
+        e.Cancel = true;
+        Hide();
+    }
+
+    private void Logo_Click(object sender, MouseButtonEventArgs e)
+    {
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = "https://dangerousthings.com",
+                UseShellExecute = true
+            });
+        }
+        catch
+        {
+            // Silently fail if browser can't be opened
+        }
+    }
+}