semi implemented and features implemented save checkpoint

docs/features/unchecked/web/overlay-host-component.md

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+# Overlay Host Component
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Centralized overlay/drawer management system with signal-based store for coordinating slide-in panels, modals, and drawers across the application.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/layout/overlay-host/`
+- **Components**:
+  - `overlay-host` (`src/Web/StellaOps.Web/src/app/layout/overlay-host/overlay-host.component.ts`)
+- **Source**: SPRINT_20260118_001_FE_shell_navigation_redesign.md
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to the relevant page/section where this feature appears
+  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
+- **Core verification**:
+  - [ ] Verify the component renders correctly with sample data
+  - [ ] Verify interactive elements respond to user input
+  - [ ] Verify data is fetched and displayed from the correct API endpoints
+- **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)