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/Dialogs/UserPromptDialog.xaml

@@ -0,0 +1,48 @@
+<Window x:Class="HC_APTBS.Views.Dialogs.UserPromptDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        mc:Ignorable="d"
+        Title="{DynamicResource Dialog.UserManage.Prompt.AddTitle}"
+        Height="170" Width="420"
+        ResizeMode="NoResize"
+        WindowStartupLocation="CenterOwner"
+        FontFamily="Ebrima"
+        Background="#FFEDEDED">
+
+    <Grid Margin="16,12">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="110"/>
+            <ColumnDefinition/>
+        </Grid.ColumnDefinitions>
+
+        <!-- Username (hidden when UsernameVisible == false) -->
+        <Label x:Name="LblUsername"
+               Content="{DynamicResource Dialog.UserCheck.Username}"
+               VerticalAlignment="Center" HorizontalAlignment="Right"/>
+        <TextBox x:Name="TbUsername" Grid.Column="1"
+                 Margin="8,4" Height="26" VerticalContentAlignment="Center"/>
+
+        <!-- Password -->
+        <Label Grid.Row="1"
+               Content="{DynamicResource Dialog.UserCheck.Password}"
+               VerticalAlignment="Center" HorizontalAlignment="Right"/>
+        <PasswordBox x:Name="PbPassword" Grid.Row="1" Grid.Column="1"
+                     Margin="8,4" Height="26" VerticalContentAlignment="Center"/>
+
+        <!-- Buttons -->
+        <StackPanel Grid.Row="2" Grid.Column="1"
+                    Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,12,0,0">
+            <Button Content="{DynamicResource Common.Accept}" Width="80" Height="26" Margin="0,0,8,0"
+                    Click="OnAccept" IsDefault="True"/>
+            <Button Content="{DynamicResource Common.Cancel}" Width="80" Height="26"
+                    IsCancel="True"/>
+        </StackPanel>
+    </Grid>
+</Window>