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/AuthGateView.xaml

@@ -0,0 +1,85 @@
+<UserControl x:Class="HC_APTBS.Views.UserControls.AuthGateView"
+             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="240" d:DesignWidth="500">
+    <!--
+      Wraps any child content behind an operator-authentication gate.
+      DataContext = AuthGateViewModel. Set GatedContent via the attached-like
+      property below to supply the content to show when authenticated.
+
+      Usage (in a parent view):
+        <uc:AuthGateView DataContext="{Binding AdaptationAuth}">
+            <uc:AuthGateView.GatedContent>
+                <uc:DfiManageView DataContext="{Binding DfiViewModel}"/>
+            </uc:AuthGateView.GatedContent>
+        </uc:AuthGateView>
+    -->
+    <UserControl.Resources>
+        <BooleanToVisibilityConverter x:Key="BoolToVis"/>
+    </UserControl.Resources>
+
+    <Grid>
+        <!-- ── Locked state: authenticate prompt ─────────────────────── -->
+        <Border Background="#F5F5F5" BorderBrush="#CCC" BorderThickness="1"
+                CornerRadius="4" Padding="20" Margin="6">
+            <Border.Style>
+                <Style TargetType="Border">
+                    <Setter Property="Visibility" Value="Visible"/>
+                    <Style.Triggers>
+                        <DataTrigger Binding="{Binding IsAuthenticated}" Value="True">
+                            <Setter Property="Visibility" Value="Collapsed"/>
+                        </DataTrigger>
+                    </Style.Triggers>
+                </Style>
+            </Border.Style>
+
+            <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
+                <TextBlock Text="🔒"
+                           HorizontalAlignment="Center" FontSize="40" Margin="0,0,0,8"/>
+                <TextBlock Text="{DynamicResource AuthGate.LockedTitle}"
+                           FontSize="14" FontWeight="SemiBold"
+                           HorizontalAlignment="Center" Margin="0,0,0,4"/>
+                <TextBlock Text="{DynamicResource AuthGate.LockedMessage}"
+                           FontSize="12" Foreground="#666"
+                           HorizontalAlignment="Center" TextWrapping="Wrap"
+                           MaxWidth="360" TextAlignment="Center" Margin="0,0,0,14"/>
+                <Button Content="{DynamicResource AuthGate.Authenticate}"
+                        Command="{Binding AuthenticateCommand}"
+                        HorizontalAlignment="Center"
+                        MinWidth="160" Height="34" FontWeight="Bold"/>
+            </StackPanel>
+        </Border>
+
+        <!-- ── Unlocked state: child content + re-lock button ─────────── -->
+        <Grid Visibility="{Binding IsAuthenticated, Converter={StaticResource BoolToVis}}">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="*"/>
+            </Grid.RowDefinitions>
+
+            <Border Grid.Row="0" Background="#E8F5E9" BorderBrush="#66BB6A"
+                    BorderThickness="0,0,0,1" Padding="10,4" Margin="6,6,6,0">
+                <Grid>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="*"/>
+                        <ColumnDefinition Width="Auto"/>
+                    </Grid.ColumnDefinitions>
+                    <TextBlock FontSize="12" Foreground="#2E7D32" VerticalAlignment="Center">
+                        <Run Text="{DynamicResource AuthGate.UnlockedAs}"/>
+                        <Run Text="{Binding AuthenticatedUser, Mode=OneWay}" FontWeight="Bold"/>
+                    </TextBlock>
+                    <Button Grid.Column="1"
+                            Content="{DynamicResource AuthGate.Lock}"
+                            Command="{Binding LockCommand}"
+                            Height="22" MinWidth="70" FontSize="11"/>
+                </Grid>
+            </Border>
+
+            <ContentPresenter Grid.Row="1"
+                              Content="{Binding GatedContent, RelativeSource={RelativeSource AncestorType=UserControl}}"/>
+        </Grid>
+    </Grid>
+</UserControl>