Add Debug page and fix BLE communication issues

Major changes:
- Added Debug tab with real-time message logging and hex viewer
- Implemented timed data logging ($UMTDL command) per API v1.3
- Fixed BLE message parsing to handle notifications without line endings
- Added Schema 2 support (22-field timed logging packets)
- Updated Maglink BLE UUIDs (fff0/fff1/fff2)
- Added connection timeout (10s) to prevent hanging on unavailable devices
- Added connection status display and manual push-button logging trigger
- Improved retry logging with attempt numbers and delays
- Added console window allocation for Windows debug output
- Added BLE disconnect on app close

Bug fixes:
- Fixed device name filtering for Maglink (ML-* prefix)
- Fixed RtkGps enum reference in DeviceScanViewModel
- Fixed DebugMessage namespace (moved to Models)

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

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

FieldLogger/Views/DebugPage.xaml.cs

@@ -0,0 +1,27 @@
+using FieldLogger.ViewModels;
+
+namespace FieldLogger.Views;
+
+public partial class DebugPage : ContentPage
+{
+    private readonly DebugViewModel _viewModel;
+
+    public DebugPage(DebugViewModel viewModel)
+    {
+        InitializeComponent();
+        _viewModel = viewModel;
+        BindingContext = viewModel;
+    }
+
+    protected override void OnAppearing()
+    {
+        base.OnAppearing();
+        _viewModel.OnAppearing();
+    }
+
+    protected override void OnDisappearing()
+    {
+        base.OnDisappearing();
+        _viewModel.OnDisappearing();
+    }
+}