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/ViewModels/JobDetailViewModel.cs

@@ -0,0 +1,59 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using FieldLogger.Models;
+using FieldLogger.Services.Data;
+
+namespace FieldLogger.ViewModels;
+
+[QueryProperty(nameof(JobId), "jobId")]
+public sealed partial class JobDetailViewModel : ObservableObject
+{
+    private readonly AppDatabase _database;
+
+    [ObservableProperty]
+    private int _jobId;
+
+    [ObservableProperty]
+    private string _jobName = "";
+
+    [ObservableProperty]
+    private int _pointCount;
+
+    public ObservableCollection<LoggedPoint> Points { get; } = new();
+
+    public JobDetailViewModel(AppDatabase database)
+    {
+        _database = database;
+    }
+
+    public async Task RefreshAsync()
+    {
+        var job = await _database.GetJobAsync(JobId);
+        if (job is null)
+            return;
+
+        JobName = job.Name;
+        var points = await _database.GetPointsAsync(JobId);
+        PointCount = points.Count;
+        Points.Clear();
+        foreach (var p in points)
+            Points.Add(p);
+    }
+
+    [RelayCommand]
+    private Task ViewMapAsync() => Shell.Current.GoToAsync($"//map?jobId={JobId}");
+
+    [RelayCommand]
+    private async Task DeletePointAsync(LoggedPoint point)
+    {
+        var confirmed = await Shell.Current.DisplayAlert("Delete Point",
+            $"Delete point #{point.Id} logged {point.TimestampUtc.ToLocalTime():g}?", "Delete", "Cancel");
+        if (!confirmed)
+            return;
+
+        await _database.DeletePointAsync(point.Id);
+        Points.Remove(point);
+        PointCount = Points.Count;
+    }
+}