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>

ViewModels/TemperatureControlViewModel.cs

@@ -0,0 +1,69 @@
+using System.Globalization;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using HC_APTBS.Models;
+using HC_APTBS.Services;
+
+namespace HC_APTBS.ViewModels
+{
+    /// <summary>
+    /// ViewModel for the bench Temperature Control panel:
+    /// PID setpoint input and heater / deposit cooler / inlet cooler relay toggles.
+    /// </summary>
+    public sealed partial class TemperatureControlViewModel : ObservableObject
+    {
+        private readonly IBenchService _bench;
+        private readonly IConfigurationService _config;
+
+        /// <summary>Operator-entered PID setpoint in °C (text to allow invariant parsing).</summary>
+        [ObservableProperty] private string _setpointText = "40";
+
+        /// <summary>Tolerance ±°C applied when the setpoint is committed.</summary>
+        [ObservableProperty] private string _toleranceText = "2";
+
+        /// <summary>True when the deposit heater relay is energised.</summary>
+        [ObservableProperty] private bool _isHeaterOn;
+
+        /// <summary>True when the deposit cooler relay is energised.</summary>
+        [ObservableProperty] private bool _isDepositCoolerOn;
+
+        /// <summary>True when the T-in (inlet) cooler relay is energised.</summary>
+        [ObservableProperty] private bool _isTinCoolerOn;
+
+        /// <param name="benchService">Bench service for PID setpoint and relay control.</param>
+        /// <param name="configService">Configuration service — seeds setpoint from <see cref="AppSettings"/>.</param>
+        public TemperatureControlViewModel(IBenchService benchService, IConfigurationService configService)
+        {
+            _bench  = benchService;
+            _config = configService;
+
+            // Seed setpoint from global temperature band midpoint, tolerance from its half-width.
+            int min = _config.Settings.TempMin;
+            int max = _config.Settings.TempMax;
+            int mid = (min + max) / 2;
+            int tol = (max - min) / 2;
+            SetpointText  = mid.ToString(CultureInfo.InvariantCulture);
+            ToleranceText = tol.ToString(CultureInfo.InvariantCulture);
+        }
+
+        partial void OnIsHeaterOnChanged(bool value)
+            => _bench.SetRelay(RelayNames.DepositHeater, value);
+
+        partial void OnIsDepositCoolerOnChanged(bool value)
+            => _bench.SetRelay(RelayNames.DepositCooler, value);
+
+        partial void OnIsTinCoolerOnChanged(bool value)
+            => _bench.SetRelay(RelayNames.TinCooler, value);
+
+        /// <summary>Applies the PID setpoint entered by the operator.</summary>
+        [RelayCommand]
+        private void ApplySetpoint()
+        {
+            if (!double.TryParse(SetpointText, NumberStyles.Float, CultureInfo.InvariantCulture, out double sp))
+                return;
+            if (!double.TryParse(ToleranceText, NumberStyles.Float, CultureInfo.InvariantCulture, out double tol))
+                tol = 2;
+            _bench.SetTemperatureSetpoint(sp, tol);
+        }
+    }
+}