Initial commit: FieldLogger MAUI app with Maglink BLE support

Added Maglink RTK GNSS receiver integration with correct BLE UUIDs and device name filtering (ML-* prefix).

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

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

FieldLogger/Views/HomePage.xaml.cs

@@ -0,0 +1,29 @@
+using FieldLogger.ViewModels;
+
+namespace FieldLogger.Views;
+
+public partial class HomePage : ContentPage
+{
+    private readonly HomeViewModel _viewModel;
+    private bool _initialized;
+
+    public HomePage(HomeViewModel viewModel)
+    {
+        InitializeComponent();
+        BindingContext = _viewModel = viewModel;
+    }
+
+    protected override async void OnAppearing()
+    {
+        base.OnAppearing();
+        if (!_initialized)
+        {
+            _initialized = true;
+            await _viewModel.InitializeAsync();
+        }
+        else
+        {
+            await _viewModel.RefreshJobAsync();
+        }
+    }
+}