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>

Services/IBenchService.cs

@@ -43,6 +43,14 @@ namespace HC_APTBS.Services
         /// </summary>
         event Action<string >? EmergencyStopTriggered; //reason
 
+        /// <summary>
+        /// Raised on a 0→1 transition to a pump-status state whose
+        /// <see cref="StatusBitValue.Reaction"/> is non-zero during a measurement phase.
+        /// Args: (bit, reaction, description) where reaction is 1=abort, 2=warning, 3=log.
+        /// Fires on a background thread — consumers must marshal to the UI thread.
+        /// </summary>
+        event Action<int, int, string>? StatusReactionTriggered; //bit, reaction, description
+
         // ── Active pump ───────────────────────────────────────────────────────────
 
         /// <summary>
@@ -191,6 +199,14 @@ namespace HC_APTBS.Services
         /// <summary>Requests a controlled stop of the currently running test sequence.</summary>
         void StopTests();
 
+        /// <summary>
+        /// Immediately triggers an emergency stop: zeros RPM, zeros pump parameters,
+        /// cancels any running test, and fires <see cref="EmergencyStopTriggered"/>.
+        /// Intended for operator-initiated E-Stop from the Dashboard.
+        /// </summary>
+        /// <param name="reason">Human-readable reason logged and propagated to the event.</param>
+        void RequestEmergencyStop(string reason);
+
         // ── Lock angle ────────────────────────────────────────────────────────────
 
         /// <summary>
@@ -226,5 +242,12 @@ namespace HC_APTBS.Services
         /// Fires on a background thread — consumers must marshal to the UI thread.
         /// </summary>
         event Action<string , double >? MeasurementSampled; //parameterName, value
+
+        /// <summary>
+        /// Fires once per second during a phase's conditioning and measurement sub-sections.
+        /// Args: (section, remainingSeconds, totalSeconds) where section is "Conditioning" or "Measuring".
+        /// Fires on a background thread — consumers must marshal to the UI thread.
+        /// </summary>
+        event Action<string, int, int>? PhaseTimerTick;
     }
 }