feat: page-based navigation shell + Tests page wizard

Replace the monolithic MainWindow with a SelectedPage-driven shell
(Dashboard / Pump / Bench / Tests / Results / Settings). The Tests
page gets the Plan -> Preconditions -> Running -> Done wizard from
ui-structure.md \u00a74, backed by a 7-item precondition gate and
shared sub-views (PhaseCardView / TestSectionView / GraphicIndicatorView)
extracted from the now-deleted monolithic TestPanelView.

New VMs / views:
- Tests wizard: TestPreconditions, PhaseCard, GraphicIndicator,
  TestSection, TestPlan, TestRunning, TestDone
- Dashboard panels: DashboardConnection, DashboardReadings,
  DashboardAlarms, InterlockBanner, ResultHistory
- Pump / bench panels: PumpIdentificationPanel, PumpLiveData,
  UnlockPanel, BenchDriveControl, BenchReadings, RelayBank,
  TemperatureControl, DtcList, AuthGate
- Dialogs: generic ConfirmDialog, UserManageDialog, UserPromptDialog

Supporting changes:
- IsOilPumpOn exposed on MainViewModel for precondition evaluation
- RequiresAuth added to TestDefinition (XML round-trip)
- BipStatusDefinition + CompletedTestRun models
- ~35 new Test.* localization keys (en + es)
- Settings moved from modal dialog to full page
- Pause / Retry / Skip stubs in TestRunningView; full spec in
  docs/gap-test-running-controls.md for follow-up implementation
- docs/ui-structure.md captures the wizard design

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Views/UserControls/RelayBankView.xaml

@@ -0,0 +1,49 @@
+<UserControl x:Class="HC_APTBS.Views.UserControls.RelayBankView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignHeight="220" d:DesignWidth="180">
+    <!--
+      Curated bank of auxiliary relay toggles.
+      DataContext = RelayBankViewModel.
+    -->
+    <UserControl.Resources>
+        <Style x:Key="RelayToggle" TargetType="ToggleButton">
+            <Setter Property="Height" Value="28"/>
+            <Setter Property="FontSize" Value="11"/>
+            <Setter Property="FontWeight" Value="SemiBold"/>
+            <Setter Property="Margin" Value="0,2,0,0"/>
+            <Setter Property="Content" Value="{DynamicResource Bench.RelayOff}"/>
+            <Setter Property="Background" Value="LightGray"/>
+            <Style.Triggers>
+                <Trigger Property="IsChecked" Value="True">
+                    <Setter Property="Content" Value="{DynamicResource Bench.RelayOn}"/>
+                    <Setter Property="Background" Value="#26C200"/>
+                    <Setter Property="Foreground" Value="White"/>
+                </Trigger>
+            </Style.Triggers>
+        </Style>
+    </UserControl.Resources>
+
+    <Border Background="#FAFAFA" BorderBrush="#DDD" BorderThickness="1" CornerRadius="4" Padding="8">
+        <StackPanel>
+            <TextBlock Text="{DynamicResource Bench.Relays}"
+                       FontSize="13" FontWeight="SemiBold" Foreground="#333"
+                       Margin="0,0,0,6"/>
+
+            <TextBlock Text="{DynamicResource Bench.Electronic}" FontSize="10" Foreground="DimGray"/>
+            <ToggleButton Style="{StaticResource RelayToggle}"
+                          IsChecked="{Binding IsElectronicOn}"/>
+
+            <TextBlock Text="{DynamicResource Bench.Flasher}" FontSize="10" Foreground="DimGray" Margin="0,8,0,0"/>
+            <ToggleButton Style="{StaticResource RelayToggle}"
+                          IsChecked="{Binding IsFlasherOn}"/>
+
+            <TextBlock Text="{DynamicResource Bench.Pulse4Signal}" FontSize="10" Foreground="DimGray" Margin="0,8,0,0"/>
+            <ToggleButton Style="{StaticResource RelayToggle}"
+                          IsChecked="{Binding IsPulse4SignalOn}"/>
+        </StackPanel>
+    </Border>
+</UserControl>