feat: complete UM Trace iOS and field UI integration

FieldLogger/Views/Controls/AppStatusBar.xaml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:vm="clr-namespace:FieldLogger.ViewModels"
+             x:Class="FieldLogger.Views.Controls.AppStatusBar"
+             x:DataType="vm:AppStatusViewModel">
+    <Border BackgroundColor="{DynamicResource UlColorSurfaceStrong}"
+            StrokeThickness="0" Padding="12,8">
+        <Grid RowDefinitions="Auto,Auto" RowSpacing="4">
+            <Grid ColumnDefinitions="*,*" ColumnSpacing="12">
+                <HorizontalStackLayout Spacing="6">
+                    <Label Text="●" FontSize="13"
+                           TextColor="{Binding LocatorState, Converter={StaticResource StateColor}}"
+                           VerticalTextAlignment="Center" />
+                    <Label Text="{Binding LocatorStatus}" FontSize="12"
+                           TextColor="{DynamicResource UlColorOnStrong}"
+                           LineBreakMode="TailTruncation" />
+                </HorizontalStackLayout>
+                <HorizontalStackLayout Grid.Column="1" Spacing="6">
+                    <Label Text="●" FontSize="13"
+                           TextColor="{Binding GnssState, Converter={StaticResource StateColor}}"
+                           VerticalTextAlignment="Center" />
+                    <Label Text="{Binding GnssStatus}" FontSize="12"
+                           TextColor="{DynamicResource UlColorOnStrong}"
+                           LineBreakMode="TailTruncation" />
+                </HorizontalStackLayout>
+            </Grid>
+            <Label Grid.Row="1" Text="{Binding PositionSummary}" FontSize="12"
+                   FontFamily="{StaticResource UlTypeFamilyMono}"
+                   TextColor="{DynamicResource UlColorOnStrong}"
+                   LineBreakMode="TailTruncation"
+                   SemanticProperties.Description="Current GNSS fix type, estimated accuracy, satellites, and correction age" />
+        </Grid>
+    </Border>
+</ContentView>

FieldLogger/Views/Controls/AppStatusBar.xaml.cs

@@ -0,0 +1,40 @@
+using FieldLogger.ViewModels;
+
+namespace FieldLogger.Views.Controls;
+
+public partial class AppStatusBar : ContentView
+{
+    private IDispatcherTimer? _staleTimer;
+
+    public AppStatusBar()
+    {
+        InitializeComponent();
+    }
+
+    protected override void OnHandlerChanged()
+    {
+        base.OnHandlerChanged();
+
+        if (Handler is null)
+        {
+            _staleTimer?.Stop();
+            _staleTimer = null;
+            return;
+        }
+
+        if (_staleTimer is not null)
+            return;
+
+        _staleTimer = Dispatcher.CreateTimer();
+        _staleTimer.Interval = TimeSpan.FromSeconds(1);
+        _staleTimer.Tick += (_, _) => (BindingContext as AppStatusViewModel)?.Refresh();
+        _staleTimer.Start();
+        (BindingContext as AppStatusViewModel)?.Refresh();
+    }
+
+    protected override void OnBindingContextChanged()
+    {
+        base.OnBindingContextChanged();
+        (BindingContext as AppStatusViewModel)?.Refresh();
+    }
+}

FieldLogger/Views/Controls/FloatingMenuButton.xaml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="FieldLogger.Views.Controls.FloatingMenuButton">
+    <Button Text="☰" FontSize="24" FontAttributes="Bold"
+            WidthRequest="56" HeightRequest="56" CornerRadius="28"
+            Padding="0" Margin="16"
+            BackgroundColor="{DynamicResource UlColorPrimary}"
+            TextColor="{DynamicResource UlColorOnPrimary}"
+            BorderColor="{DynamicResource UlColorSurfaceRaised}" BorderWidth="2"
+            Clicked="OnMenuClicked"
+            SemanticProperties.Description="Open UM Trace menu"
+            MinimumHeightRequest="{StaticResource UlTouchComfortable}"
+            MinimumWidthRequest="{StaticResource UlTouchComfortable}" />
+</ContentView>

FieldLogger/Views/Controls/FloatingMenuButton.xaml.cs

@@ -0,0 +1,15 @@
+namespace FieldLogger.Views.Controls;
+
+public partial class FloatingMenuButton : ContentView
+{
+    public FloatingMenuButton()
+    {
+        InitializeComponent();
+    }
+
+    private void OnMenuClicked(object? sender, EventArgs e)
+    {
+        if (Shell.Current is not null)
+            Shell.Current.FlyoutIsPresented = true;
+    }
+}