semi implemented and features implemented save checkpoint

docs/features/unchecked/web/platform-health-dashboard.md

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+# Platform Health Dashboard
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Platform health dashboard showing service health grid for 13 services, dependency graph visualization, incident timeline with auto-root-cause suggestions, and aggregate metrics.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/platform-health/`
+- **Routes**: `platform-health.routes.ts`
+- **Components**:
+  - `incident-timeline` (`src/Web/StellaOps.Web/src/app/features/platform-health/incident-timeline.component.ts`)
+  - `platform-health-dashboard` (`src/Web/StellaOps.Web/src/app/features/platform-health/platform-health-dashboard.component.ts`)
+  - `service-detail` (`src/Web/StellaOps.Web/src/app/features/platform-health/service-detail.component.ts`)
+- **Source**: SPRINT_20251229_032_FE_platform_health_dashboard
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to `/ops/health`
+  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
+- **Core verification**:
+  - [ ] Verify the dashboard loads without errors and displays summary cards/metrics
+  - [ ] Verify data refreshes correctly and loading states are shown
+  - [ ] Verify empty state is displayed when no data is available
+- **Edge cases**:
+  - [ ] Verify graceful handling when backend API is unavailable (error state)
+  - [ ] Verify responsive layout at different viewport sizes
+  - [ ] Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)