save checkpoint: save features

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

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+# Overlay Host Component
+
+## Module
+Web
+
+## Status
+VERIFIED
+
+## 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`)
+- **Store**:
+  - `overlay.store` (`src/Web/StellaOps.Web/src/app/layout/overlay-host/overlay.store.ts`)
+- **Verification harness**:
+  - `src/Web/StellaOps.Web/src/tests/overlays/overlay-host-component.spec.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 drawer/modal overlays correctly
+  - [ ] Verify escape and backdrop interactions close overlays deterministically
+  - [ ] Verify open overlays receive keyboard focus for accessibility
+- **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)
+
+## Verification
+- Run: `docs/qa/feature-checks/runs/web/overlay-host-component/run-001/`
+- Tier 0 (source): pass (`tier0-source-check.json`)
+- Tier 1 (build/tests): pass (`tier1-build-check.json`)
+- Tier 2 (behavior): pass (`tier2-e2e-check.json`)
+- Verified on (UTC): `2026-02-11T10:01:16.1411477Z`