feat(04-04): wire ReviewStep as step index 3; add 'Review' label to StepIndicator

- Import ReviewStep in App.tsx and add as steps[3]
- Update STEP_LABELS in StepIndicator.tsx to include 'Review' as fourth entry
- Update comment: 1.Backend > 2.Remote Config > 3.Deployment > 4.Review
- Full npm test suite (98 tests, 12 files) remains GREEN

src/App.tsx

@@ -8,6 +8,7 @@ import { StepIndicator } from './components/wizard/StepIndicator';
 import { BackendSelectionStep } from './components/wizard/BackendSelectionStep';
 import { RemoteConfigStep } from './components/wizard/RemoteConfigStep';
 import { DeploymentStep } from './components/wizard/DeploymentStep';
+import { ReviewStep } from './components/wizard/ReviewStep';
 
 function WizardShell() {
   const { state } = useWizard();
@@ -17,9 +18,10 @@ function WizardShell() {
     // Key on backendType to force remount when backend changes — prevents stale form values
     <RemoteConfigStep key={state.remote.backendType ?? 'none'} />,
     <DeploymentStep key="deployment" />,
+    <ReviewStep key="review" />,
   ];
 
-  // Guard: clamp to valid range (phase 4 will add step 3 for review/download)
+  // Guard: clamp to valid range
   const stepIndex = Math.min(state.currentStep, steps.length - 1);
   const CurrentStep = steps[stepIndex];
 

src/components/wizard/StepIndicator.tsx

@@ -1,11 +1,11 @@
 // src/components/wizard/StepIndicator.tsx
-// Breadcrumb navigation — 1.Backend > 2.Remote Config > 3.Deployment
+// Breadcrumb navigation — 1.Backend > 2.Remote Config > 3.Deployment > 4.Review
 // Completed steps are clickable. Clicking step 0 also clears remote.params (SET_REMOTE_PARAMS({})).
 // CRITICAL: never dispatches RESET — deployment options must be preserved on back navigation.
 
 import { useWizard } from '../../store/context';
 
-const STEP_LABELS = ['Backend', 'Remote Config', 'Deployment'];
+const STEP_LABELS = ['Backend', 'Remote Config', 'Deployment', 'Review'];
 
 export function StepIndicator() {
   const { state, dispatch } = useWizard();