fix(apps): honour the unit preference on the Live Map page

The Map Overview (Live Map) page hard-defaulted to metric, so current speed / location-history
speed / odometer rendered km·h and km while the rest of the app (and the web) showed imperial
for the account. Thread the resolved unit preference into the page so the render boundary
converts to the account units.

- MapOverviewPage gains an optional units ctor arg passed through to its view-model (defaults
  to metric, so the parameterless/test ctors are unchanged).
- The shell LiveMap factory passes AppSettingsHost.Current.ToUnitPref(); ApplySettings already
  rebuilds the page on a units flip, so it stays in sync.

Gates: full sln build 0 err, dotnet format clean, 31537 tests pass.
Verified via live screenshot: Live Map now shows mph / mi matching http://localhost:3000.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: atulmgupta

apps/windows/TeslaSync.App/Shell/ShellWindow.xaml.cs

@@ -1229,7 +1229,9 @@ private void RegisterDataBackedPages()
         _viewModel.PageFactory.Register("LiveMap", () =>
         {
             var page = new FeatureViews.Maps.MapOverviewPage(
-                new FeatureViews.Maps.MapOverviewClientFeed(_data.Api), _data.Localizer);
+                new FeatureViews.Maps.MapOverviewClientFeed(_data.Api),
+                _data.Localizer,
+                AppSettingsHost.Current.ToUnitPref());
             page.NavigationRequested += (_, route) => NavigateTo(route);
             return page;
         });

apps/windows/TeslaSync.App/feature-views/MapOverviewPage/MapOverviewPage.cs

@@ -16,6 +16,7 @@
 using TeslaSync.App.Core.Forms;
 using TeslaSync.App.Core.Maps;
 using TeslaSync.App.Core.Notifications;
+using TeslaSync.App.Core.Units;
 using TeslaSync.App.Notifications;
 
 namespace TeslaSync.App.FeatureViews.Maps;
@@ -112,12 +113,13 @@ public MapOverviewPage()
     /// <summary>Creates the page over an explicit feed and localizer (used by tests / dependency injection).</summary>
     /// <param name="feed">The map-overview data port.</param>
     /// <param name="localizer">The i18n facade every label resolves through.</param>
-    public MapOverviewPage(IMapOverviewFeed feed, ILocalizer localizer)
+    /// <param name="units">The user's unit-display preference (applied at the render boundary); defaults to metric.</param>
+    public MapOverviewPage(IMapOverviewFeed feed, ILocalizer localizer, UnitPref? units = null)
     {
         ArgumentNullException.ThrowIfNull(feed);
         ArgumentNullException.ThrowIfNull(localizer);
 
-        _viewModel = new MapOverviewPageViewModel(feed, localizer);
+        _viewModel = new MapOverviewPageViewModel(feed, localizer, units);
 
         Content = BuildLayout();